$$[H^+] = 1 \times 10$$^{-3}$$ \text{ M}$$

Question 1

Which of the following best describes the chemical behavior of an acid when dissolved in water?

Accepted Answer

It donates hydrogen ions ($$H^+$$), increasing the concentration of hydronium ions ($$H_3O^+).$$

Question 2

A cleaning product is most likely to have which of the following properties?

Accepted Answer

High concentration of $$OH^-$$ ions and a slippery texture

Question 3

Which equation correctly represents the dissociation of sodium hydroxide ($$NaOH) in $$water?

Accepted Answer

$$NaOH \rightarrow Na^+ + OH^-$$

Question 4

If a solution has a pH of 3, what is the concentration of hydrogen ions ($$[H^+]) in $$the solution?

Accepted Answer

$$[H^+] = 1 	imes 10$$^{-3}$$ 	ext{ M}$$

Question 5

How many times more acidic is a solution with pH 1 compared to a solution with pH 3?

Accepted Answer

100 times

Question 6

Which of the following is a correct chemical equation for the reaction of hydrochloric acid ($$HCl) $$with water?

Accepted Answer

$$HCl + H_2O \rightarrow H_3O^+ + Cl^-$$

Question 7

What happens when an acid reacts with a base in an aqueous solution?

Accepted Answer

A salt and water are produced.

Question 8

Which of the following best explains why blood pH remains relatively stable even when small amounts of acid are added?

Accepted Answer

Blood contains buffers that absorb excess hydrogen ions.

Question 9

Which of the following is the correct formula for calculating pH?

Accepted Answer

$$pH = -\log [H^+]$$

Question 10

A solution has an $$OH^-$$ concentration of $$1 	imes 10$$^{-9}$$ M. What is the pH of the solution?

Accepted Answer

Question 11

Which of the following is a property of a buffer?

Accepted Answer

It minimizes changes in pH by absorbing or releasing $$H^+$$ ions.

Question 12

Which of the following is an example of a neutral compound?

Accepted Answer

Pure water

Question 13

Which of the following statements about the pH scale is correct?

Accepted Answer

A solution with pH 2 is 10 times more acidic than a solution with pH 3.

Question 14

Which of the following is a correct description of a base?

Accepted Answer

A substance that decreases $$[H^+] by $$releasing $$OH^-$$ ions

Question 15

Which of the following is the correct chemical equation for the dissociation of nitric acid ($$HNO_3) in $$water?

Accepted Answer

$$HNO_3 + H_2O$$ \rightarrow H_3O^+ + $$NO_3$$^-$$

Question 16

Which of the following best describes the role of bicarbonate in blood?

Accepted Answer

It acts as a buffer, helping to maintain blood pH within a narrow range.

Question 17

If the concentration of $$[H^+] in a $$solution is $$1 	imes 10$$^{-8}$$ M, what is the pH?

Accepted Answer

pH = 8

Question 18

Which of the following is a real-world example of a buffer system?

Accepted Answer

Bicarbonate/carbonic acid system in blood

Question 19

Which of the following best explains why proteins in cells are sensitive to changes in pH?

Accepted Answer

Changes in pH can alter the charge and shape of proteins, affecting their function.

Question 20

Which of the following is true about the relationship between $$[H^+]$$ and $$[OH^-] in $$pure water at equilibrium?

Accepted Answer

$$[H^+] = [OH^-] = 1 	imes 10$$^{-7}$$ M

Acids, Bases, and pH: Principles and Biological Importance

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