Q: If the concentration of $$[\mathrm{OH}^-] in a $$solution is $$2.0 \times 10$$^{-3}$$\ \mathrm{M} at$$ $$25^\circ\mathrm{C}$$, what is the concentration of $$[\mathrm{H}_3\mathrm{O}^+]$$?

$$5.0 \times 10$$^{-12}$$\ \mathrm{M}$$

Question 1

Which of the following statements best explains why James Bond's gold pen is not dissolved by most acids, while iron bars can be dissolved?

Accepted Answer

Gold is one of the few metals that is not dissolved by most acids due to its low reactivity.

Question 2

Which property is NOT characteristic of acids?

Accepted Answer

Acids feel slippery to the touch.

Question 3

Which of the following is a correct balanced chemical equation for the reaction of hydrochloric acid with magnesium metal?

Accepted Answer

$$2 \mathrm{HCl}(aq) + \mathrm{Mg}(s) \rightarrow \mathrm{H}_2(g) + \mathrm{MgCl}_2(aq)$$

Question 4

Which of the following acids is responsible for the sour taste of vinegar?

Accepted Answer

Acetic acid

Question 5

According to the Arrhenius definition, which of the following is true?

Accepted Answer

An acid produces $$\mathrm{H}^+$$ ions in aqueous solution.

Question 6

Which of the following is a Bronsted-Lowry base?

Accepted Answer

A substance that accepts a proton.

Question 7

What is the net ionic equation for the neutralization reaction between an acid and a base according to the Arrhenius definition?

Accepted Answer

$$\mathrm{H}^+(aq) + \mathrm{OH}^-(aq) \rightarrow \mathrm{H}_2\mathrm{O}(l)$$

Question 8

Which of the following statements about strong acids is correct?

Accepted Answer

Strong acids completely ionize in solution.

Question 9

A solution has $$[\mathrm{H}_3\mathrm{O}^+] = 1.8 	imes 10$$^{-4}$$\ \mathrm{M}. $$What is its pH and is it acidic or basic?

Accepted Answer

pH = 3.74, acidic

Question 10

Which of the following best describes a buffer solution?

Accepted Answer

A solution that resists changes in pH by containing significant amounts of a weak acid and its conjugate base.

Question 11

Which of the following is a correct representation of the self-ionization of water?

Accepted Answer

$$2 \mathrm{H}_2\mathrm{O}(l) \rightleftharpoons \mathrm{H}_3\mathrm{O}^+(aq) + \mathrm{OH}^-(aq)$$

Question 12

If the concentration of $$[\mathrm{OH}^-] in a $$solution is $$2.0 	imes 10$$^{-3}$$\ \mathrm{M} at$$ $$25^\circ\mathrm{C}$$, what is the concentration of $$[\mathrm{H}_3\mathrm{O}^+]$$?

Accepted Answer

$$5.0 	imes 10$$^{-12}$$\ \mathrm{M}$$

Question 13

Which of the following is a correct statement about the pH scale at $$25^\circ\mathrm{C}$$?

Accepted Answer

A solution with pH \u003e 7 is basic.

Question 14

Which of the following is a correct calculation for the concentration of $$[\mathrm{H}_3\mathrm{O}^+] in a $$solution with pH = 4.80?

Accepted Answer

$$[\mathrm{H}_3\mathrm{O}^+] = 1.6 	imes 10$$^{-5}$$\ \mathrm{M}$$

Question 15

Which of the following is true about strong bases such as $$\mathrm{NaOH}$$ and $$\mathrm{KOH}$$?

Accepted Answer

They completely dissociate in water to produce $$\mathrm{OH}^-$$ ions.

Question 16

A titration is performed by adding $$12.54\ \mathrm{mL} of$$ $$0.100\ \mathrm{M}\ \mathrm{NaOH} to$$ $$10.00\ \mathrm{mL} of an $$unknown $$\mathrm{HCl}$$ solution. What is the concentration of the $$\mathrm{HCl}$$ solution?

Accepted Answer

$$0.125\ \mathrm{M}$$

Question 17

Which of the following best describes the role of a conjugate base in a buffer solution?

Accepted Answer

It neutralizes added acid.

Question 18

Which of the following reactions is an example of a neutralization reaction?

Accepted Answer

$$\mathrm{HCl}(aq) + \mathrm{NaOH}(aq) \rightarrow \mathrm{H}_2\mathrm{O}(l) + \mathrm{NaCl}(aq)$$

Acids and Bases: Properties, Definitions, and Reactions

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