Answers
A 50.0 mL solution of 0.250 M HC₂H₃O₂ before and after adding 50 mL of 0.250 M NaOH has a pH of 2.87, the pH changes due to the formation of a buffer solution, which can be calculated using the Henderson-Hasselbalch equation.
How to calculate pH of the solution?This problem requires us to calculate the pH of a buffer solution after the addition of a strong base. A buffer solution is one that resists pH changes when modest amounts of acid or base are added. The buffer system in this case is the weak acid, acetic acid (HC₂H₃O₂) and its conjugate base, acetate ion (C₂H₃O₂-).
Before the addition of NaOH, we have a solution of 0.250 M HC₂H₃O₂, which we can assume to be completely dissociated in water:
HC₂H₃O₂ + H₂O ⇌ H₃O+ + C₂H₃O₂-
HC₂H₃O₂ has a Ka value of 1.8 x 10-5. We can use this Ka value to calculate the equilibrium concentration of H3O+ and C₂H₃O₂- in the solution.
First, we need to calculate the initial concentrations of HC₂H₃O₂ and C₂H₃O₂-.
moles of HC₂H₃O₂ = 0.250 M × 0.0500 L = 0.0125 mol
moles of C₂H₃O₂- = 0 mol (since there is no NaOH added yet)
Since HC₂H₃O₂ is a weak acid, it only partially dissociates in water. The equilibrium concentrations of H₃O+ and C₂H₃O₂- can be calculated using the Ka expression:
Ka = [H₃O+][C₂H₃O₂-]/[HC₂H₃O₂]
We can assume that the initial concentration of H3O+ is negligible compared to the amount that will be produced by the dissociation of HC₂H₃O₂, so we can simplify the expression to:
Ka = [H₃O+]²/[HC₂H₃O₂]
[H₃O+]² = Ka × [HC₂H₃O₂]
[H₃O+]² = 1.8 × 10⁻⁵ × 0.0125
[H₃O+] = 1.34 × 10⁻³ M
Now that we know the equilibrium concentration of H₃O+, we can use the pH formula to calculate the pH:
pH = -log[H₃O+]
pH = -log(1.34 × 10⁻³)
pH = 2.87
This is the pH of the buffer solution before the addition of NaOH.
Next, we add 50 mL of 0.250 M NaOH to the solution. NaOH is a strong base, so it completely dissociates in water to produce OH- ions:
NaOH → Na+ + OH-
The OH- ions will react with the acetate ions in the buffer solution to form water and acetate ions:
OH- + C₂H₃O₂- → H₂O + C₂H₃O₂-
This reaction will consume some of the acetate ions in the buffer solution, causing the equilibrium to shift to the left to produce more acetate ions.
To calculate the new concentrations of H₃O+ and C₂H₃O₂-, we need to use the Henderson-Hasselbalch equation:
pH = pKa + log([C₂H₃O₂-]/[HC₂H₃O₂])
where pKa = -log(Ka), [C₂H₃O₂-] is the equilibrium concentration of acetate ions, and [HC₂H₃O₂] is the equilibrium concentration of acetic acid.
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Related Questions
CuI2 (light brown solid) name copper compounds
Answers
CuI2 is not a known compound. Copper compounds typically have different oxidation states for copper, resulting in various compound names.
Copper(II) oxide (CuO): It is a black solid compound where copper is in the +2 oxidation state. It is commonly used as a pigment and in catalytic reactions.
Copper(II) sulfate (CuSO4): It is a blue crystalline compound in which copper is in the +2 oxidation state. It is used in various applications such as agriculture, electroplating, and as a laboratory reagent.
Copper(I) oxide (Cu2O): It is a red crystalline compound in which copper is in the +1 oxidation state. It is used as a pigment, in solar cells, and as a catalyst.
Copper(II) chloride (CuCl2): It is a greenish-brown solid compound in which copper is in the +2 oxidation state. It is utilized in various chemical processes, including etching and catalyst synthesis.
Copper(II) nitrate (Cu(NO3)2): It is a blue crystalline compound where copper is in the +2 oxidation state. It is commonly used in the production of catalysts, as a coloring agent, and in electroplating.
These are just a few examples of copper compounds with different oxidation states and properties. It's important to note that the compound CuI2 mentioned in the question, if it exists, would be an exception to the typical nomenclature for copper compounds.
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Fill the blanks
According to the Arrhenius definition, acids produce ---------------- ions when dissolved in water, and bases produce -------------------- ions when dissolved in water.
A) Protons, ammonium
b) Hydroxide, hydronium
C) ammonium, hydronium
d) hydronium, hydroxide
Answers
The Correct answer is D
Hydronium
hydroxide
When 3.00 moles of hydrogen molecules and 1.50 moles of oxygen molecules react, they form 3.00 moles of water
according to the reaction below.
2H, + O2 + 2H2O
How many grams of oxygen were required?
Answers
Answer:
Mass = 48 g
Explanation:
Given data:
Number of moles of H₂ react= 3.00 mol
Number of moles of O₂ react= 1.50 mol
Number of moles of water formed = 3.00 mol
Mass of oxygen react = ?
Solution:
Chemical equation:
2H₂ + O₂ → 2H₂O
It is stated in given question when 1.50 moles of oxygen react 3.00 moles of water are formed. Thus, mass of 1.50 moles of oxygen is
Mass of oxygen:
Mass = number of moles × molar mass
Mass = 1.50 mol × 32 g/mol
Mass = 48 g
True or False:
Carbon forms an incredible variety of substances
because it has eight valence electrons making it a
very stable atom that readily bonds.
Answers
Answer:
true i think but dont take my word for it.✌
According to the electronic configuration, carbon has 4 valence electrons that makes it a very stable atom that readily bonds.
What is electronic configuration?Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.
Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.
Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.
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An unknown substance has a density of 4G/CM three and a volume of 25 CM three. What is its mass in grams
Answers
Answer:
100g
Explanation:
Formula
Mass
Density Volume
Mass = Density X Volume
Mass=4g/cm^3 X 25cm^3
Mass =100grams
what is the most important part of solution preparation
Answers
Answer:
id k exactly what your asking
Explanation:
The value of A for an atom containing 12 protons, 12 electrons and 16 neutrons is
a. 24
b.4
C. 28
d. 12
e. 16
Answers
Answer: A = atomic number = 12
Explanation: A (atomic number) defines the chemical element. It is the numbervof protons or electrons. Neutron numbers may vary, produving isotopes of differing atomic mass. This isotope has atomic mass 28. The atomic number 12 = carbon. C28 does not really exist. If it could be produced it would be radioactive with an almost zero halflife.
How would you prepare 1.00 L of a 0.50 M solution of each of the following?
NiCl2 from the salt NiCl2. 6H2O
Answers
1. To prepare 0.5 M NiCl₂ solution, dissolve 64.8 g of NiCl₂ in 1 L of water
2. To prepare 0.5 M NiCl₂.6H₂O solution, dissolve 118.8 g of NiCl₂.6H₂O in 1 L of water
How to prepare solution1. How to prepare 0.5 M NiCl₂ solution
We'll begin by obtaining the mole of NiCl₂. This can be obatined as follow:
Volume = 1 LMolarity = 0.5 MMole of NiCl₂ =?Mole = Molarity x Volume
Mole of NiCl₂ = 0.5 × 1
Mole of NiCl₂ = 0.5 mole
Finally, can obtain the mass of NiCl₂ needed to prepare the solution as follow:
Mole of NiCl₂ = 0.5 moleMolar mass of NiCl₂ = 129.6 g/molMass of NiCl₂ =?Mass = mole × molar mass
Mass of NiCl₂ = 0.5 × 129.6
Mass of NiCl₂ = 64.8 g
Thus, to prepare 0.5 M NiCl₂, dissolve 64.8 g of NiCl₂ in 1 L of water
2. How to prepare 0.5 M NiCl₂.6H₂O solution
We'll begin by obtaining the mole of NiCl₂.6H₂O This can be obatined as follow:
Volume = 1 LMolarity = 0.5 MMole of NiCl₂.6H₂O =?Mole = Molarity x Volume
Mole of NiCl₂.6H₂O = 0.5 × 1
Mole of NiCl₂.6H₂O = 0.5 mole
Finally, can obtain the mass of NiCl₂.6H₂O needed to prepare the solution as follow:
Mole of NiCl₂.6H₂O = 0.5 moleMolar mass of NiCl₂.6H₂O = 237.6 g/molMass of NiCl₂.6H₂O =?Mass = mole × molar mass
Mass of NiCl₂ = 0.5 × 237.6
Mass of NiCl₂.6H₂O = 118.8 g
Thus, to prepare 0.5 M NiCl₂.6H₂O dissolve 118.8 g of NiCl₂.6H₂O in 1 L of water
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What will increased temperature in a reaction cause
1 Particles in a reaction to move more slowly
2 Particles in a reaction to move faster
3 Particles in a reaction to generate more electrical ions
4 Particles in a reaction to lose more electrical ions
Answers
During photosynthesis, the following reaction takes place:
carbon dioxide + water + light energy → sugar + oxygen
During cellular respiration, the following reaction takes place:
sugar + oxygen → carbon dioxide + water + chemical energy
Given this information, how are photosynthesis and cellular respiration related?
Question 1 options:
A. Photosynthesis and cellular respiration both produce the same materials.
B. The same type of energy is found in both photosynthesis and cellular respiration.
C. The products of photosynthesis are the reactants of cellular respiration.
D. Photosynthesis and cellular respiration both start with the same materials.
Answers
Answer:
C
The products of photosynthesis are the reactants of cellular respiration.
Explanation:
it is correct on study island
Based on the above information, photosynthesis and cellular respiration are related because: C. The products of photosynthesis are the reactants of cellular respiration.
What is photosynthesis?Photosynthesis can be defined as a biological and chemical process through which green plants (autotrophs) transform light energy (sunlight) into chemical energy.
The reaction for photosynthesis.In Science, photosynthesis is given by the following chemical reaction:
\(Carbon \;dioxide + water + light \;energy \rightarrow sugar + oxygen\)
The reaction for cellular respiration.In Science, cellular respiration is given by the following chemical reaction:
\(sugar + oxygen \rightarrow carbon \;dioxide + water + chemical\; energy\)
In conclusion, we can deduce from the above information that the products of photosynthesis (sugar and oxygen) are the reactants of cellular respiration.
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determine if the following compounds are soluble (s) or insoluble (i) in what we based on the solubility chart
a. (NH4)2CO3
b.Fe(OH)2
c.CaOH
d. PbCl2
Answers
The solubility chart provides information about the solubility of various compounds in water. Here are the solubilities of the given compounds:
a. (NH₄)₂CO₃: According to the solubility chart, most carbonate (CO₃²⁻) salts are insoluble, except for those of Group 1 metals (alkali metals) and ammonium (NH₄⁺). Therefore, (NH₄)₂CO₃ is soluble.
b. Fe(OH)₂: Hydroxide (OH⁻) salts of transition metals, including iron (Fe), are generally insoluble, except for those of Group 1 metals and ammonium. Therefore, Fe(OH)₂ is insoluble.
c. Ca(OH)₂: Calcium hydroxide (Ca(OH)₂) is soluble. However, the given compound "CaOH" appears to be missing the subscript ₂, indicating two hydroxide ions. If it should be Ca(OH)₂, then it is soluble.
d. PbCl₂: According to the solubility chart, chloride (Cl⁻) salts, including lead chloride (PbCl₂), are generally soluble, except for those of silver (Ag⁺), lead (Pb²⁺), and mercury (Hg₂²⁺). Therefore, PbCl₂ is insoluble.
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what is molecular weight of ash?
Answers
Molecular Weight: 75.9296 g/mol
Answer:
AsH(2.) CHEBI:33104
Explanation:
Molecular Weight is : 75.9296 g/mol
H2N-(CH2)6 -NH2The compound above is one of the monomers of (A)Perupex(B)terylase(C)nylon(D)Urea
Answers
Answer
(C) nylon
Explanation
H2N-(CH2)6 -NH2 is hexamethylene diamine. The condensation reaction of hexamethylenediamine and adipic acid will produce a polymer, nylon.
Therefore, H2N-(CH2)6 -NH2 is one of the monomers of nylon
The correctanswer is (C)nylon
You start with 0.1 L of a 5.00 M solution, and you plan to dilute it to make a
solution with a concentration of 0.625 M. How much water did you add to
the container?
a) 800ML
b) 100ml
c)700ml
d)750ml
Answers
A solution containing 113. g of KCl in 270. g of H2O at 50 ∘C is cooled to 20 ∘C . It goes to 34 degrees Celsius when cooled down.
Answers
The solution of KCl in water will undergo precipitation of KCl crystals as the temperature decreases from 50 °C to 20 °C and then to 34 °C due to the decreasing solubility of KCl in water.
What happens to a solution of KCl in water when cooled from 50 °C to 20 °C and then to 34 °C?
When the solution of KCl in water is cooled from 50 °C to 20 °C, the solubility of KCl in water decreases. As a result, some of the KCl will start to come out of the solution and form solid crystals.
Then, when the temperature of the solution is further decreased from 20 °C to 34 °C, the solubility of KCl in water decreases even further, causing more KCl to come out of the solution and form solid crystals. This is known as precipitation.
The amount of KCl that will come out of the solution depends on the solubility of KCl at the respective temperatures. The solubility of KCl in water is about 34 g/100 mL at 20 °C and about 42 g/100 mL at 34 °C. Therefore, when the solution is cooled from 50 °C to 20 °C, some KCl will come out of solution until the concentration in solution reaches about 34 g/100 mL. Further cooling to 34 °C will cause more KCl to come out of solution until the concentration in solution reaches about 42 g/100 mL.
The exact amount of KCl that will come out of solution can be calculated using thermodynamic models and experimental data on the solubility of KCl in water at different temperatures.
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HELP ME OUT PLS!!!!!
A swimmer makes a turn at a pool wall.
Which answer choice best describes the direction the swimmer accelerates when she pushes against the wall?
A) Away from her push because the wall exerts an equal and opposite force
B) Away from her push because the wall exerts a stronger force in the same direction
C) Same direction as her push because the wall exerts an equal force in the same direction
D) Same direction as her push because the wall exerts a stronger and opposite force
Answers
Answer:
C
Explanation:
Well Its called reaction force, so that helps you figure out what direction she would go towards. When you use anything that has reaction force what way are they normally going? So thats why she stayed still.
What is the molar concentration of Zn2+ ions in a solution, if the electrode potential value is 59mV less than the standard electrode potential value at 298 K?
Answers
Molar concentration of Zn2+ions in a solution is 3.481 mol/lit
The electrode potential value is 59mV
Temperature=298k
What is electrode potential?
It is a force of galvanic cell. basically it is the difference between an electrolyte and electrode.equation formed- Zn → Zn2+ + 2e
from Nernst equation-
E=E cell - 0.059 log [Zn2+]
[zn2+]=3.481 mol/lit
hence, Molar concentration of Zn2+ions in a solution is 3.481 mol/lit
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9.31g is the same mass as ?
Answers
9.31 g should be the same mass as 9,310 mg.
Given that,
The mass is 9.31 g.Based on the above information, the calculation is as follows:
Since, 1 gram (g) = 103 milligram (mg)
So,
i.e \(9.31 g = 9.31 \times 103 mg\)
= 9310 mg
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Calculate the relative molecular mass of aspartame.
Answers
The chemical formula of aspartame is C₁₄H₁₈N₂O₅ and it's relative molecular mass is 294.30 g/mol which is calculated as (12×14)+(1×18)+(14×2)+(16×5).
What is molecular mass?Molecular mass of a compound or a molecule is defined as the mass of the elements which are present in it.The molecular mass is considered to be a bulk quantity not a molecular quantity. It is often an average of the of the masses at many instances.
The molar mass and formula mass are used as synonym for the molecular mass.It does not depend on the amount of substance which is present in the sample.It has units of gram/mole.
Molecular masses of an element are given as relative atomic masses while that of compounds is the sum of relative atomic masses which are present in the compound.In case of aspartame it is calculated as,(12×14)+(1×18)+(14×2)+(16×5)=294.30 g/mol.
Thus , relative molecular mass or molecular mass of aspartame is 294.30 g/mol.
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Forensics:
roshni, a forensic scientist, has ruled out several different drugs when testing a substance found in a car. She suspects that the substance is cocsine, what should roshni do next?
1-Perform a confirmatory test
2-Put the substance in a bag, label it, and send it to a DEA office
3-Confer with a colleague about her suspicions.
4-Collect a blood sample and see if it also contains the same substance
Answers
Since she suspects that the substance is cocsine, the thing that she should do next is option 1-Perform a confirmatory test.
How the Evidence Is Collected?The way that Drug evidence is collected is that from any crime scene, evidence is obtained, photographed, packaged, documented as well as been sent for analysis and then the forensic scientist will carry out the Analysis.
Since the evidence has been sent to Roshni, all she has to do is to carry out the confirmatory test to see if the drug is what she suspected.
Therefore, Since she suspects that the substance is cocsine, the thing that she should do next is option 1-Perform a confirmatory test.
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Phosphine (PH3) can be prepared by the reaction of calcium phosphide , Ca3P2: based on this equation : Ca3P2 + 6H2O —-> 3 Ca(OH)2 + 2 PH3
Based on this equation , which of the following statements are correct?
(a) one mole of Ca3P2 produces 2 mol of PH3
(b) one gram of Ca3P2 produces 2g of PH3
(c) Three moles of Ca(OH)2 are produced for each 2 mol of PH3 produced
(d) the mole ratio between phosphine and calcium phosphide is 2 mol PH3 over 1 mol Ca3P2
Answers
Taking into account the reaction stoichiometry, you can observe that:
one mole of Ca₃P₂ produces 2 mol of PH₃.the mole ratio between phosphine and calcium phosphide is 2 mol PH₃ over 1 mol Ca₃P₂.Reaction stoichiometryIn first place, the balanced reaction is:
Ca₃P₂ + 6 H₂O → 3 Ca(OH)₂ + 2 PH₃
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
Ca₃P₂:1 mole H₂O: 6 molesCa(OH)₂: 3 molesPH₃: 2 molesThe molar mass of the compounds is:
Ca₃P₂: 182 g/mole H₂O: 18 g/moleCa(OH)₂: 74 g/molePH₃: 34 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
Ca₃P₂: 1 mole ×182 g/mole= 182 grams H₂O: 6 moles× 18 g/mole= 108 gramsCa(OH)₂: 3 moles ×74 g/mole= 222 gramsPH₃: 2 moles ×34 g/mole= 68 gramsCorrect statementsThen, by reaction stoichiometry, you can observe that:
one mole of Ca₃P₂ produces 2 mol of PH₃.the mole ratio between phosphine and calcium phosphide is 2 mol PH₃ over 1 mol Ca₃P₂.Learn more about the reaction stoichiometry:
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Without SALT or SUGAR, does the water conduct electricity?
Answers
A student collected a 1.28 g sample of Magnesium. How many atoms of Mg are in his sample?
A student did an experiment that called for 1.24 x 1024 molecules of CaO. What is the mass of her reactant?
A student reacted 0.0405 g of glucose (C6H12O6). How many molecules of glucose did he react?
Answers
Which of the following activities is most likely to result in nutrient pollution?
a.
cutting down trees
b.
pouring motor oil down the drain
c.
excess fertilizer use
d.
none of the above
Please select the best answer from the choices provided
A
B
C
D
Which of the following activities is most likely to result in sediment pollution?
a.
cutting down trees
b.
pouring motor oil down the drain
c.
excess fertilizer use
d.
none of the above
Please select the best answer from the choices provided
A
B
C
D
A new wastewater treatment plant opens in an area where raw sewage used to be dumped directly into a bay. What type of pollution will be reduced the most by the new plant?
a.
toxic
b.
sediment
c.
nutrient
d.
bacterial
Please select the best answer from the choices provided
A
B
C
D
Answers
Answer:
1. D excess fertilizer use
2.A cutting down trees
3.D bacterial
what is the zeff of carbon ??????
plz bata do
Answers
Answer : La carga nuclear efectiva (Zef) es la carga positiva neta experimentada por un electrón en un átomo polielectrónico. El término "efectiva" se usa porque el efecto pantalla de los electrones más cercanos al núcleo evita que los electrones en orbitales superiores experimenten la carga nuclear completa
Explanation:
How many liters of gasoline contain 1.98kg of gasoline
Answers
Answer:1.4652
Explanation:
0.74g/ml
0.74x1.98
=1.4652
In an electrical circuit, the presence of a resistor limits the current and prevents
damage related to short circuits.
True or
False
Answers
Which is the conjugate acid base pair in the following equation.
H 2 SO4+ H20 —> HSO 4 -1 + H3O+1
H2SO4 and HSO4-1
H2SO4-1 and H3O+1
H3O+1 and H2SO4
Answers
Answer:
the correct answer is H2SO4 and HSO4-41
A gas has a volume of 54.0 mL at 475 torr and -13 degrees C . What will be the new volume be at STP?
Answers
Answer:35.437 mL
Explanation:
Combined gas law
P1V1/T1 = P2V2/T2
P1= 475 torr
V1= 54 mL
T1= 260.15 Kelvin
T2= 273.15 Kelvine
P2= 760 torr
V2=
V2=P1V1T2/(T1P2) m
V2= 475 X 54 X 273.15 / (260.15 X 760) =35.437 mL
HELPPP LOOK AT PICTURE
Answers
Answer:
it is a square
Explanation:
I hope it will helps you
sorry it's not a true answer
because I want points