$$[\mathrm{H_3O^+}] \times [\mathrm{OH^-}] = 1 \times 10$$^{-14}$$

They accept H\textsuperscript{+} ions.

Question 1

Which of the following best describes a strong acid in aqueous solution?

Accepted Answer

It completely ionizes, with reactants fully converted to products.

Question 2

What is the correct balanced chemical equation for the neutralization reaction between hydrochloric acid and sodium hydroxide?

Accepted Answer

$$\mathrm{HCl} + \mathrm{NaOH} \rightarrow \mathrm{NaCl} + \mathrm{H_2O}$$

Question 3

A solution has $$[\mathrm{H^+}] = 1 	imes 10$$^{-4}$$ mol/L. What is its pH?

Accepted Answer

pH = 4

Question 4

Which statement correctly describes the behavior of weak acids in water?

Accepted Answer

They partially ionize, establishing equilibrium between reactants and products.

Question 5

What is the product when ammonia ($$\mathrm{NH_3$}) $$reacts with water?

Accepted Answer

$$\mathrm{NH_4$^+}$$~and~\mathrm{OH^-}$

Question 6

If a solution turns litmus paper blue, which of the following is most likely true?

Accepted Answer

The solution contains a base.

Question 7

Which of the following is the correct expression for the ion product of water at 25°C?

Accepted Answer

$$[\mathrm{H_3O^+}] 	imes [\mathrm{OH^-}] = 1 	imes 10$$^{-14}$$

Question 8

A sample of pure water at 25°C has $$[\mathrm{H_3O^+}] = 1 	imes 10$$^{-7}$$ mol/L. What is its pH and is it acidic, basic, or neutral?

Accepted Answer

pH = 7; neutral

Question 9

Which of the following is a property of bases?

Accepted Answer

They accept H	extsuperscript{+} ions.

Question 10

A solution has $$[\mathrm{OH^-}] = 1 	imes 10$$^{-2}$$ mol/L. What is the $$[\mathrm{H_3O^+}]$$ in this solution at 25°C?

Accepted Answer

$$1 	imes 10$$^{-12}$$ mol/L

Question 11

Which of the following best explains why weak bases like ammonia do not completely ionize in water?

Accepted Answer

The reaction reaches equilibrium, with both reactants and products present.

Question 12

If the pH of a solution is 2, what is the concentration of H	extsuperscript{+} ions?

Accepted Answer

$$1 	imes 10$$^{-2}$$ mol/L

Question 13

Which of the following is true about the pH scale?

Accepted Answer

A pH of 7 is neutral.

Question 14

A student mixes equal volumes of a strong acid and a strong base. What is the expected pH of the resulting solution?

Accepted Answer

pH = 7

Question 15

Which of the following equations represents the autoionization of water?

Accepted Answer

$$\mathrm{H_2O} + \mathrm{H_2O} \rightleftharpoons \mathrm{H_3O^+} + \mathrm{OH^-}$$

Question 16

A solution has a pH of 9. Which of the following best describes this solution?

Accepted Answer

It is basic (alkaline).

Question 17

Which of the following is a correct property of strong bases?

Accepted Answer

They completely ionize in water.

Question 18

If $$[\mathrm{H_3O^+}] = 1 	imes 10$$^{-10}$$ mol/L, what is the pH of the solution?

Accepted Answer

pH = 10

Question 19

Which of the following best describes the process of neutralization?

Accepted Answer

An acid and a base react to form a salt and water.

Acids, Bases, and the pH Scale: Fundamental Concepts

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