When a solution is titrated with an acid, an indicator In- changes from blue to yellow HIn. The Ka of the indicator is 8.2e-6. At what pH will the indicator color change first be visible?

Answers

Answer 1

When the system is changed color, neutralization has occurred and the amount of acid (or base) has been balanced with the amount of base.

What is an acid, exactly, in chemistry?

Any substance that when dissolved in aqueous solution has a sour taste, causes the blue litmus paper to turn red, interacts with some minerals to liberate hydrogen, or mixes with bases to produce compounds that promote chemical processes is considered an acid.

What does acid do in the body?

Acidosis is the medical term for when a large amount of acid causes the body's pH to become unbalanced. If the mechanisms of elimination cannot remove too much acid, it might cause major health problems.

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Related Questions

Club soda is an aqueous solution of carbon dioxide. A sample of club soda is titrated with 0.04202M NaOH(aq) according to the reaction equation below:
CO2(aq)+2NaOH(aq)→Na2CO3(aq)
If it takes 32.14 mL of 0.04202M NaOH(aq) to react with a 25.00 mL sample of club soda, what is the concentration of CO2 in club soda (in g/L )?

Answers

The concentration of CO2 in club soda is approximately 1.1964 g/L.

To find the concentration of CO2 in club soda, we need to use the stoichiometry of the reaction and the volume and concentration of the NaOH solution used.

The balanced equation for the reaction is:

CO2(aq) + 2NaOH(aq) → Na2CO3(aq)

From the stoichiometry of the equation, we can see that 1 mole of CO2 reacts with 2 moles of NaOH. Therefore, the moles of CO2 can be calculated using the volume and concentration of NaOH solution used.

Given that 32.14 mL of 0.04202 M NaOH solution was used, we can calculate the moles of NaOH:

moles of NaOH = volume (L) × concentration (M)

moles of NaOH = 32.14 mL × 0.04202 mol/L

moles of NaOH = 0.001351 mol

According to the stoichiometry of the equation, 1 mole of CO2 reacts with 2 moles of NaOH. Therefore, the moles of CO2 can be calculated as:

moles of CO2 = (moles of NaOH) / 2

moles of CO2 = 0.001351 mol / 2

moles of CO2 = 0.0006755 mol

Now, we need to convert the moles of CO2 to grams. The molar mass of CO2 is approximately 44.01 g/mol.

mass of CO2 = moles of CO2 × molar mass of CO2

mass of CO2 = 0.0006755 mol × 44.01 g/mol

mass of CO2 = 0.02979 g

Finally, we need to express the concentration of CO2 in club soda in g/L. We are given that the sample of club soda used is 25.00 mL.

concentration of CO2 = (mass of CO2) / (volume of club soda in L)

concentration of CO2 = 0.02979 g / (25.00 mL × 0.001 L/mL)

concentration of CO2 = 1.1964 g/L

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In terms of percentages, what are the 3 biggest uses of natural gases?

Answers

1) Using Gas In The Home. In our homes, we end up utilizing the material every day.

2) Use In The Industrial Sector. The industrial sector makes similar use of natural gas liquids as a fuel for process heating and raw material to produce chemicals, fertilizers, and hydrogen.

3) Transportation.

Hope this helps. Btw, I love ur pfp!

Answer:

1) Using Gas In The Home. In our homes, we end up utilizing the material every day. ...

2) Use In The Industrial Sector. The industrial sector makes similar use of natural gas liquids as a fuel for process heating and raw material to produce chemicals, fertilizers, and hydrogen.

3) Transportation.

Question 2 (1 point) 6. Rebecca has written a story. Which sentence from the story shows that it is fiction? I got Max when he was a kitten. He is black with a white spot on his chest. Max told me that he got his white spot by jumping through the snow. His spot makes him the cutest cat in the world! He is black with a white spot on his chest I got Max when he was a kitten Max told me that he got his white spot by jumping through the snow. His spot makes him the cutest cat in the world!

Answers

The sentence that shows that the story is fiction is "Max told me that he got his white spot by jumping through the snow." This is because cats cannot talk, and this statement is not based on reality.

The nurse discovers that one of her assigned clients is bleeding excessively from an abdominal incision. The nurse gives specific prescriptions to an unlicensed assistive personnel (UAP) to attend to the other clients and tells another nurse to call the primary health care provider immediately. In this situation, the nurse is implementing which leadership style?

Answers

A Good Samaritan law will protect the nurse.

How did Moseley establish a more accurate periodic table?
by arranging the elements according to atomic mass instead of atomic number
by arranging the elements according to atomic number instead of atomic mass
by arranging the elements into horizontal periods
by arranging the elements into vertical groups

Answers

Answer: B. "by arranging the elements according to atomic number instead of atomic mass"

Explanation:

just took the quiz on edge

Moseley established a more accurate periodic table by arranging the elements according to atomic number instead of atomic mass.

The modern periodic law states that the properties of elements are a periodic function of their atomic numbers.

This is a great departure from the earlier theories in which elements were arranged in order of increasing atomic mass leading to inconsistencies in the properties of elements.

The approach of Moseley was to arrange the properties of elements in order of increasing atomic number.

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How did Moseley establish a more accurate periodic table?by arranging the elements according to atomic

True or false? Increasing the force will increase the moment.

Answers

The statement "increasing the force will increase the moment" is true.

This is because the moment is a measure of the turning effect of a force on an object about a pivot point. It is defined as the product of the force and the perpendicular distance between the force and the pivot point. The unit of moment is the newton-meter (Nm) or the joule (J).When a force is applied to an object, it will produce a moment about the pivot point if the force is not acting along the same line as the pivot point. The magnitude of the moment depends on the force applied and the distance of the force from the pivot point. As the force increases, the moment also increases, provided that the distance from the pivot point remains constant. Conversely, if the force remains constant, but the distance from the pivot point increases, the moment also increases. This is because the perpendicular distance is directly proportional to the moment, meaning that a longer distance results in a larger moment.Therefore, it can be concluded that increasing the force applied to an object will increase the moment produced about a pivot point.

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starting with the idea of isostasy and ending with plate tectonics, explain how scientists understanding of the earth's crust has changed

Answers

Plate Tectonics is the study of the movement and changes in the rocks that make up the earth's crust. Isostasy is the equilibrium in the earth's crust maintained by a flow of rock material in the asthenosphere.

The concept behind pre-continental drift was that in addition to the pressure of contraction, isostatic adjustments also caused the crust's heavier portions to sink and its lighter portions to rise. It was believed that the Earth's interior was a viscous fluid that could support this rising and sinking.Wegener put up the theory that continents can move in 1915 based on fossil data, how coasts appeared to fit together, and other traits, but it was not well received at the time.He noticed that rock ages, and mountain belts match up across the boundaries of continents if you put the continents back together as the "jigsaw puzzle fit" proposes.On continents that are currently divided by water, fossils of identical terrestrial flora and animals have been discovered.New data from the ocean floor, including topography and rock magnetism, played a major role in the development of plate tectonic theory in the 1960s.On the basis of symmetrical patterns, seafloor spreading was hypothesized as a mechanism to propel the migration of the continents.

Hence this led to scientists understanding of the earth's crust has changed.

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What is the volume of 1g of ice in cm3?

Answers

Answer:

What is the volume of 1g of ice in cm3?

Explanation:

What is the basic unit of stucture and function of living things

Answers

Cells are the basic unit of structure/living things.

At room temperature, a substance with a
boiling point of 212 degrees Fahrenheit
will be in what phase of matter?
A. solid
B. liquid
C. gas
D. plasma

Answers

The answer is B. A liquid

An unknown element (Uk) has three isotopes, as presented in
the table below. One of the percentage values is missing.
After calculating the missing percent abundance (%).
determine the average atomic mass of Uk.
Enter your answer to the hundredths place.
Percent
Abundance
(%)
Uk-66 65.994 58.00
Isotope Mass
Notation (amu)
Uk-69 68.958
Uk-71 70.975
10.00
?

Answers

The average atomic mass of the element, Uk is 67.44 amu.

What is the average atomic mass of the element, Uk?

The average atomic mass of the element Uk is determined from the sum of the isotopic masses of the isotopes of the element and their relative abundances.

average atomic mass = sum of (isotopic mass * relative abundance) of the isotopes

The isotopic masses and relative abundance of the isotopes are given below:

Isotope:Uk-66; Isotopic mass = 65.994; relative abundance = 58.00%

Isotope:Uk-69; Isotopic mass = 68.958; relative abundance = ?

Isotope:Uk-71; Isotopic mass = 70.975; relative abundance = 10.00%

Relative abundance of Uk-69 = 100% - (58 + 10)% = 32%

The average atomic mass of Uk = (65.994 * 58.00%) + (68.958 * 32%) + (70.975 * 10.00%)

The average atomic mass of Uk = 67.44 amu

In conclusion, the average atomic mass of an element is obtained from the of the isotopic masses of the isotopes of the element and their relative abundances.

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Who were the terrorists that attacked the united states on September 11, 2001

Answers

The ones flying the plane

Nadia runs from her house to a fiend's house that is 24 meters away. How much time she will take to reach her friend's house, knowing that Nadia's speed is 3 m/s .

Answers

Nadia will take 8 seconds to reach her friend's house.

Speed is the measure of the distance traveled by an object per unit of time. It is a scalar quantity and is typically expressed in units such as meters per second (m/s), miles per hour (mph), or kilometers per hour (km/h).

To calculate the time Nadia will take to reach her friend's house, we can use the formula;

time = distance / speed

where distance is the amount of space traveled by an object, and time is the duration of travel.

Put the values given in the problem, we have:

time = 24 meters / 3 m/s

time = 8 seconds

Therefore, Nadia will take 8 seconds.

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How many mL of 2.25M H2SO4 are needed to react completely with 69.9g BaO2

Answers

Answer:

4 millllllermeeters jb

how many moles of Ca are in 7.2x10^25 molecules of Ca
(show work)

Answers

Answer:

119.60 moles

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

$n = \frac{N}{L} \\$

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

$n = \frac{7.2 \times {10}^{25} }{6.02 \times {10}^{23} } \\ =119.60132...$

We have the final answer as

119.60 moles

Hope this helps you

describe what xeriscaping is and what is involved in a successful xeriscaping project

Answers

Xeriscaping is a landscaping approach that focuses on conserving water by using drought-tolerant plants and efficient irrigation techniques. The goal is to create a visually appealing and sustainable garden while minimizing water usage.

Successful xeriscaping projects involve several key elements. Firstly, careful plant selection is crucial, opting for species that can thrive in arid conditions without excessive watering. Mulching is used to reduce evaporation and retain soil moisture.

Proper soil preparation, such as improving drainage and adding organic matter, promotes healthier plant growth. Efficient irrigation systems, like drip irrigation or soaker hoses, deliver water directly to plant roots, minimizing wastage.

Additionally, controlling erosion through the use of retaining walls or terracing is important. Lastly, regular maintenance, including appropriate pruning and weed control, ensures the longevity and vitality of the xeriscape garden. Overall, a successful xeriscaping project harmonizes sustainable practices with a beautiful outdoor environment.

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871g of sodium chloride is how many moles

Answers

Answer:

14.9 mol

Explanation:

To find the number of moles in a given mass of a sample of sodium chloride (NaCl), we can multiply the number of grams in the sample by the molar mass of sodium chloride, which is 58.44 g/mol.

871 g × (1 mol / 58.44 g)

= 871/58.44 mol

≈ 14.9 mol

Note that we rounded to 3 significant figures in the final answer because that is how many significant figures were given in the mass measurement of the sodium chloride sample.

If 30.0 g of Nal (MM = 149.89 g/mol) are added to a 500.0 mL
volumetric flask, and water is added to fill the flask, what is the
concentration of Nal in the resulting solution?

Answers

The concentration of Nal in the resulting solution is 0.4 gL⁻¹.

Concentration is the abundance of a constituent divided by way of the overall volume of an aggregate. several sorts of mathematical descriptions may be outstanding: mass concentration, molar concentration, variety concentration, and extent awareness.

Calculation:

moles = mass / molar mass

= 30/149.89

= 0.2

volume = 500 ml = 0.5 L

Concentration = moles / volume

= 0.2 / 0.5

= 0.4 gL⁻¹

The Concentration of an answer is a measure of the quantity of solute that has been dissolved in a given amount of solvent or answer. A concentrated answer is one that has a rather huge quantity of dissolved solute

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An unknown alcohol (C4H10O) reacted slowly with metallic sodium and gave positive results with NaOI. Have you sufficient information to be reasonably certain which of the butyl alcohols the unknown may be? Explain

Answers

The unknown butyl alcohol which reacted slowly with metallic sodium and gave positive results with NaOI is: 1-iodo, butan-2-ol.

Discussion:

When metallic sodium reacts with an unknown alcohol, and NaOI is produced. In essence, the alcohol compound has an iodo-group on one of it's carbon atoms and therefore has it's alcoholic, -OH group on carbon position 2.

Answers

The equilibrium concentration of SO₂(g), NO₂(g), SO3(g), NO(g) are 0.543M, 0.543M, 1.053M and 1.053M respectively.

Given,

Equilibrium Constant K = 3.75

[SO₂] = [NO₂] = [SO3] = [NO] = 0.800M

We have to calculate the equilibrium concentration of the above gases.

Chemical reaction:

SO₂(g) + NO₂(g) --- SO3(g) + NO(g)

ICE table for the above equation:

I 0.800 0.800

0.800 0.800

C -x -x

x x

E (0.800-x) (0.800-x)

(0.800+x) (0.800+x)

The equilibrium constant can be written as

K = [SO3] [NO]/ [SO₂] [NO₂]

= (0.800-x)(0.800-x) / (0.800+x) (0.800+x)

3.75 = (0.800-x)(0.800-x) / (0.800+x) (0.800+x)

x = 0.253M

[SO₂] = [NO₂] = 0.800- 0.253 = 0.543M

[SO3] = [NO] = 0.800+ 0.253 = 1.053M

Thus, we calculated that for the reaction

SO₂(g) + NO₂(g) --- SO3(g) + NO(g),

the equilibrium concentration of SO₂(g), NO₂(g), SO3(g), NO(g) are 0.543M, 0.543M, 1.053M and 1.053M respectively.

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For the reaction Ti(s)+2F2(g)→TiF4(s) compute the theoretical yield of the product (in grams) for each of the following initial amounts of reactants. You may want to reference (Pages 299 - 306) Section 7.5 while completing this problem. Part B 2.6 g Ti, 1.4 g F2 Express your answer using two significant figures.

Answers

The theoretical yield of the titanium tetra fluoride is 2.3 g.

What is the theoretical yield?

We know that we can be able to obtain the theoretical yield from the stoichiometry of the reaction. We already have the balanced chemical reaction equation as shown in the question.

Number of moles of Titanium = 2.6 g/49 g/mol = 0.053 moles

Number of moles of fluorine = 1.4 g/38 g/mol = 0.037 moles

Given that 1 mole of Titanium reacts with 2 moles of fluorine

0.053 moles reacts with 0.053 moles * 2 moles/ 1 mole

= 0.106 moles

Thus fluorine is the limiting reactant

Now;

2 moles of fluorine produces 1 mole of titanium fluoride

0.037 moles of fluorine produces 0.037 moles * 1 mole/ 2 moles

= 0.0185 moles

Theoretical yield of the product = 0.0185 moles * 124 g/mol

= 2.3 g

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TRUE or FALSE: As temperature increases, the speed of sound decreases.

Answers

Answer:

TRUE

Explanation:

Answer:

True

Explanation:

because high energy molecules carry the sound more quickly

what is conductor?
give two examples.

Answers

Answer:

Conductor is any material tht allows he flow of electrons or electric current . Ex: Metals like iron and copper.

Hope im right!!

Answer:-

Examples of conductors include metals, aqueous solutions of salts (i.e., ionic compounds dissolved in water), graphite, and the human body. Examples of insulators include plastics, Styrofoam, paper, rubber, glass and dry air.

how many liters of N2 gas is needed to produce 500 L NH3?

Answers

I think the answer is 101.2 L

What is rent? A. The amount you spend on needs each month B. The amount you pay to purchase a house C. The amount you pay to live in a space such as an apartment D. The amount you pay for electricity and water

Answers

C. The amount you pay to live in’s space such as a apartment

the answer is c because that is right and the other person said

BTW this is actually a science quetion.

What is the amount of matter in an object compared to the space it takes up. Im confused because i think its mass but i was told that mass is the amount of matter something contains.

Answers

Answer:

Volume simply refers to the space an object takes up. Depending on the physical state of an object, there are a couple ways to measure volume.

Draw the electron dot formula for carbon dioxide, CO2. How many nonbonding electron pairs are in a carbon dioxide molecule

Answers

Answer:

O=C=O.

Four nonbonding electron pairs.

Explanation:

Hello!

In this case, as you can see on the attached picture, there are two double bonds between the central carbon atom and those two oxygen atoms because each oxygen shares two electrons to the central carbon for them to attain the octet. Moreover, the enclosed dots represent the nonbonding electron pairs, which are four in total. It is importante to notice that carbon dioxide (O=C=O) has a complete octet whereas carbon monoxide (C=O) does has an incomplete octet for C.

Best regards!

Draw the electron dot formula for carbon dioxide, CO2. How many nonbonding electron pairs are in a carbon

PLEASE PLEASE PLEASEEE HELP!!

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DIMENSIONAL ANALYSIS CHEMISTRY SUPER easy MOLE CONVERSIONS!!

Question : How many moles of O2 are in the sample of 3.6 kilograms of air if 21% of the air is oxygen O2 by mass?

Answers

Answer:

47.25 moles

Explanation:

First we find the amount of O2 in mass in air

That will be = (21/100) x 3.6

This will give us=0.756 kg

Now we want to find the moles, so we convert this mass into grams since we are going to be working with grams= 0.756 x 1000 = 756 grams

Now, to find the number of moles:

moles= mass / molar mass

in this case mass is 756 grams and molar mass of oxygen is 16

So, the mass divided by molar mass would be =756/16= 47.25 moles of O2

as i increase the amount of solute without changing the amount of solvent i increase the solutions....?

Answers

Answer:

concentration?

Explanation:

solute = The dissolved substance in a solution.

solvent = The liquid in which the solute dissolves to form a solution.

Answer:

the only marked thing was in new game for the quiz that link yes to be in a relationship

Explanation:

you followed a 1 or a 1 year of high.

how many moles are in 6.7 x 10^25 molecules of H2SO4

Answers

Answer:

$ \huge{ \boxed{111.30 \: \: \text{moles}}}$

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

$ \bold{n = \frac{N}{L} \\ }$

where

n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities.

From the question.

N = 6.7 × 10²⁵ $ \: H_2SO_4 \: $ molecules

$n = \frac{6.7 \times {10}^{25} }{6.02 \times {10}^{23} } \\ = 111.2956...$

We have the final answer as.

111.30 moles

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