Q: A solution has a hydronium ion concentration of $$[H_3O^+] = 1.0 \times 10$$^{-4}$$\ \mathrm{M}. $$What is the pH of this solution?

$$pH = -\log[H_3O^+] = -\log(1.0 \times 10$$^{-4}$$) = 4$$

Q: Which of the following is the correct formula for the ion product constant of water at $$25^\circ C$$?

$$K_w = [H_3O^+][OH^-] = 1.0 \times 10$$^{-14}$$

Q: A student titrates $$25.0\ \mathrm{mL} of$$ $$0.100\ \mathrm{M}$$ HCl with $$0.200\ \mathrm{M}$$ NaOH. What volume of NaOH is required to reach the equivalence point? Use $$M_1V_1 = M_2V_2.$$

$$V_2$$ = \frac{M_1V_1}{$$M_2$$} = \frac{0.100 \times 25.0}{0.200} = 12.5\ \mathrm{mL}$$

Question 1

Which of the following statements best describes a Brønsted–Lowry acid?

Accepted Answer

It donates a proton ($$H^+) in a $$chemical reaction.

Question 2

A solution has a hydronium ion concentration of $$[H_3O^+] = 1.0 	imes 10$$^{-4}$$\ \mathrm{M}. $$What is the pH of this solution?

Accepted Answer

$$pH = -\log[H_3O^+] = -\log(1.0 	imes 10$$^{-4}$$) = 4$$

Question 3

Which of the following is a correct net ionic equation for the neutralization of hydrochloric acid with sodium hydroxide?

Accepted Answer

$$H^+ + OH^- \rightarrow H_2O$$

Question 4

Which of the following compounds is a weak base commonly found in household cleaning products?

Accepted Answer

Ammonia ($$NH_3)$$

Question 5

A buffer solution is prepared using acetic acid and sodium acetate. What property does this buffer solution exhibit?

Accepted Answer

It resists changes in pH when small amounts of acid or base are added.

Question 6

Which of the following is the correct formula for the ion product constant of water at $$25^\circ C$$?

Accepted Answer

$$K_w = [H_3O^+][OH^-] = 1.0 	imes 10$$^{-14}$$

Question 7

A student titrates $$25.0\ \mathrm{mL} of$$ $$0.100\ \mathrm{M}$$ HCl with $$0.200\ \mathrm{M}$$ NaOH. What volume of NaOH is required to reach the equivalence point? Use $$M_1V_1 = M_2V_2.$$

Accepted Answer

$$V_2$$ = \frac{M_1V_1}{$$M_2$$} = \frac{0.100 	imes 25.0}{0.200} = 12.5\ \mathrm{mL}$$

Question 8

Which of the following is the correct general formula for alkanes?

Accepted Answer

$$C_nH_{2n+2}$$

Question 9

Which of the following statements about structural isomers is correct?

Accepted Answer

They have the same molecular formula but different structural arrangements.

Question 10

What is the IUPAC name for a hydrocarbon with the formula $$C_4H_{10}$$ that has a straight chain?

Accepted Answer

Butane

Question 11

Which of the following functional groups is present in all alcohols?

Accepted Answer

$$-OH ($$hydroxyl group)

Question 12

A hydrocarbon with the formula $$C_5H_{10} is $$most likely:

Accepted Answer

An alkene

Question 13

Which of the following best describes the difference between a strong acid and a weak acid?

Accepted Answer

A strong acid completely ionizes in water, while a weak acid only partially ionizes.

Question 14

Which of the following is the correct relationship between pH and pOH in aqueous solution at $$25^\circ C$$?

Accepted Answer

$$pH + pOH = 14$$

Question 15

A solution has a pOH of 3. What is the concentration of hydroxide ions in the solution?

Accepted Answer

$$[OH^-] = 10$$^{-pOH}$$ = 10$$^{-3}$$\ \mathrm{M}$$

Question 16

Which of the following best explains why straight-chain hydrocarbons have higher boiling points than their branched isomers?

Accepted Answer

Straight-chain hydrocarbons have stronger intermolecular forces due to greater surface area.

Question 17

Which of the following reactions is an example of an addition reaction?

Accepted Answer

$$CH_2$$=$$CH_2$$ + $$Br_2$$ \rightarrow CH_2Br-CH_2Br$$

Question 18

Which of the following best describes an amphoteric substance?

Accepted Answer

It can act as either an acid or a base.

Question 19

Which of the following is the correct formula for benzene?

Accepted Answer

$$C_6H_6$$

Question 20

A sample of blood is buffered to a pH of 7.4. If a small amount of strong acid is added, what will happen to the pH?

Accepted Answer

The pH will decrease only slightly due to the buffer.

Acids, Bases, and Introduction to Organic Chemistry

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