Question 1

If 10 mL of a 1 M HI solution is added to 5 mL of a 1 M KOH solution, the resulting solution would be _____.

Accepted Answer

The moles of HI (acid) are 0.01 mol and the moles of KOH (base) are 0.005 mol. Since there is more acid than base, the solution will be acidic.

Question 2

When titrating a weak acid with a strong base, approximately where would the pH be observed when reaching the equivalence point?

Accepted Answer

At the equivalence point of titrating a weak acid with a strong base, the pH is greater than 7. This is because the salt formed in the reaction hydrolyzes in water to form a basic solution.

Question 3

Which of the following is a typical type of electrode found on a pH meter?

Accepted Answer

Glass electrodes are commonly used in pH meters because they are sensitive to the hydrogen ion concentration in a solution, which is what pH measurement is all about.

Question 4

Phenolphthalein can be used as an _____ in acid-base titrations.

Accepted Answer

Phenolphthalein is an indicator that changes color at the endpoint of an acid-base titration.

Question 5

What is the pH of a solution if 10 mL of a 1 M HCl solution is added to 10 mL of a 1 M NaOH solution?

Accepted Answer

When equal volumes of 1 M HCl and 1 M NaOH are mixed, they neutralize each other completely, forming water and NaCl. The resulting solution is neutral, with a pH of 7.

Question 6

When phosphoric acid is dissolved in water, what is the conjugate acid that is formed?

Accepted Answer

When phosphoric acid (H3PO4) is dissolved in water, it can lose a hydrogen ion (H+) to form the dihydrogen phosphate ion (H2PO4^-), which acts as the conjugate acid in this context.

Question 7

When red litmus paper is in contact with a base, the litmus paper will turn _____.  Paired item 1)

Accepted Answer

Red litmus paper turns blue when it comes into contact with a base, indicating the presence of a basic or alkaline substance.

Question 8

Which of the following is an electronic device used to measure the hydrogen ion activity in aqueous solutions?

Accepted Answer

A pH meter is specifically designed to measure the hydrogen ion activity in solutions, indicating their acidity or alkalinity level, which is expressed as pH.

Question 9

When titrating a weak base with a strong acid, approximately where would the pH be observed when reaching the equivalence point?  Paired item 1)

Accepted Answer

At the equivalence point of titrating a weak base with a strong acid, the solution is acidic because the conjugate acid of the weak base does not fully dissociate, resulting in a pH less than 7.

Question 10

What are the products formed at the equivalence point when titrating a strong acid with a strong base?

Accepted Answer

At the equivalence point of titrating a strong acid with a strong base, the acid and base neutralize each other to form a salt and water.

Question 11

When blue litmus paper is in contact with an acid, the litmus paper will turn _____.

Accepted Answer

Blue litmus paper turns red when it comes into contact with an acid, indicating the acidic nature of the substance.

Question 12

Rank the following oxoacids in order of increasing acidity: HClO₂, HClO₄, HClO, HClO₃.

Accepted Answer

The acidity of oxoacids increases with the number of oxygen atoms. HClO has the least, followed by HClO2, HClO3, and HClO4 having the most, making them increasingly acidic in that order.

Question 13

When titrating a strong acid with a strong base, approximately where would the pH be observed when reaching the equivalence point?  Paired item 2)

Accepted Answer

At the equivalence point of a titration between a strong acid and a strong base, the pH is equal to 7 because the acid and base neutralize each other completely, forming a neutral salt and water.

Question 14

What is the conjugate base that is formed when carbonic acid is dissolved in water?

Accepted Answer

When carbonic acid (H2CO3) dissolves in water, it donates a proton (H+) to form its conjugate base, bicarbonate ion (HCO3-).

Question 15

Phenolphthalein can be used as an indicator in acid-base titrations. When a few drops are added to an acidic solution which is then titrated with a strong base, the color of the solution changes from _____ to _____.

Accepted Answer

Phenolphthalein is colorless in acidic and neutral solutions and turns pink in basic solutions.

Question 16

Which of the following is an amphiprotic substance?

Accepted Answer

HPO₄²⁻ can both donate a proton to become PO₄³⁻ and accept a proton to become H₂PO₄⁻, making it amphiprotic.

Question 17

Rank the following oxyanions in order of increasing basicity: ClO₄^-, ClO₂^-, ClO^-, ClO₃^-.

Accepted Answer

The basicity of oxyanions increases with the number of oxygen atoms bonded to the central atom. ClO₄^- has the most oxygen atoms and is therefore the most basic, while ClO^- has the fewest oxygen atoms and is therefore the least basic.

Question 18

If 3 mL of a 0.5 M HBr solution is added to 20 mL of a 0.5 M NaOH solution, the resulting solution would be _____.  Paired item 1)

Accepted Answer

The moles of HBr (0.5 M * 0.003 L = 0.0015 mol) are less than the moles of NaOH (0.5 M * 0.02 L = 0.01 mol), resulting in excess NaOH, making the solution basic.

Question 19

What is the conjugate base that is formed upon the addition of carbonic acid to water?

Accepted Answer

When carbonic acid (H2CO3) is added to water, it can donate a proton (H+), forming its conjugate base, bicarbonate (HCO3-).

Question 20

Which of the following is a diprotic acid?

Accepted Answer

The answer of Which of the following is a diprotic...

Quiz 14: Acid-Base Equilibria

If 10 mL of a 1 M HI solution is added to 5 mL of a 1 M KOH solution, the resulting solution would be _____.

When titrating a weak acid with a strong base, approximately where would the pH be observed when reaching the equivalence point?

Which of the following is a typical type of electrode found on a pH meter?

Phenolphthalein can be used as an _____ in acid-base titrations.

What is the pH of a solution if 10 mL of a 1 M HCl solution is added to 10 mL of a 1 M NaOH solution?

When phosphoric acid is dissolved in water, what is the conjugate acid that is formed?

When red litmus paper is in contact with a base, the litmus paper will turn _____. Paired item 1)

Which of the following is an electronic device used to measure the hydrogen ion activity in aqueous solutions?

When titrating a weak base with a strong acid, approximately where would the pH be observed when reaching the equivalence point? Paired item 1)

What are the products formed at the equivalence point when titrating a strong acid with a strong base?

When blue litmus paper is in contact with an acid, the litmus paper will turn _____.

Rank the following oxoacids in order of increasing acidity: HClO₂, HClO₄, HClO, HClO₃.

When titrating a strong acid with a strong base, approximately where would the pH be observed when reaching the equivalence point? Paired item 2)

What is the conjugate base that is formed when carbonic acid is dissolved in water?

Phenolphthalein can be used as an indicator in acid-base titrations. When a few drops are added to an acidic solution which is then titrated with a strong base, the color of the solution changes from _ to _.

Which of the following is an amphiprotic substance?

Rank the following oxyanions in order of increasing basicity: ClO₄^-, ClO₂^-, ClO^-, ClO₃^-.

If 3 mL of a 0.5 M HBr solution is added to 20 mL of a 0.5 M NaOH solution, the resulting solution would be _____. Paired item 1)

What is the conjugate base that is formed upon the addition of carbonic acid to water?

Which of the following is a diprotic acid?

Quiz 14: Acid-Base Equilibria

If 10 mL of a 1 M HI solution is added to 5 mL of a 1 M KOH solution, the resulting solution would be _____.

When titrating a weak acid with a strong base, approximately where would the pH be observed when reaching the equivalence point?

Which of the following is a typical type of electrode found on a pH meter?

Phenolphthalein can be used as an _____ in acid-base titrations.

What is the pH of a solution if 10 mL of a 1 M HCl solution is added to 10 mL of a 1 M NaOH solution?

When phosphoric acid is dissolved in water, what is the conjugate acid that is formed?

When red litmus paper is in contact with a base, the litmus paper will turn _____. Paired item 1)

Which of the following is an electronic device used to measure the hydrogen ion activity in aqueous solutions?

When titrating a weak base with a strong acid, approximately where would the pH be observed when reaching the equivalence point? Paired item 1)

What are the products formed at the equivalence point when titrating a strong acid with a strong base?

When blue litmus paper is in contact with an acid, the litmus paper will turn _____.

Rank the following oxoacids in order of increasing acidity: HClO2, HClO4, HClO, HClO3.

When titrating a strong acid with a strong base, approximately where would the pH be observed when reaching the equivalence point? Paired item 2)

What is the conjugate base that is formed when carbonic acid is dissolved in water?

Phenolphthalein can be used as an indicator in acid-base titrations. When a few drops are added to an acidic solution which is then titrated with a strong base, the color of the solution changes from _____ to _____.

Which of the following is an amphiprotic substance?

Rank the following oxyanions in order of increasing basicity: ClO4-, ClO2-, ClO-, ClO3-.

If 3 mL of a 0.5 M HBr solution is added to 20 mL of a 0.5 M NaOH solution, the resulting solution would be _____. Paired item 1)

What is the conjugate base that is formed upon the addition of carbonic acid to water?

Which of the following is a diprotic acid?

Rank the following oxoacids in order of increasing acidity: HClO₂, HClO₄, HClO, HClO₃.

Phenolphthalein can be used as an indicator in acid-base titrations. When a few drops are added to an acidic solution which is then titrated with a strong base, the color of the solution changes from _ to _.

Rank the following oxyanions in order of increasing basicity: ClO₄^-, ClO₂^-, ClO^-, ClO₃^-.