Question 1

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

Accepted Answer

A substance that can donate a proton ($$H^+)$$

Question 2

Given the reaction: $$CH_3COOH + OH^- \rightarrow CH_3COO^- + H_2O$$, which species acts as the conjugate base?

Accepted Answer

$$CH_3COO^-$$

Question 3

Which of the following compounds is considered amphoteric?

Accepted Answer

$$H_2O$$

Question 4

What is the relationship between the strength of an acid and its conjugate base?

Accepted Answer

Strong acid $$ightarrow$$ weak conjugate base

Question 5

Which equation correctly represents the acid dissociation constant ($$K_a) $$for the reaction $$HA + H_2O \rightleftharpoons A^- + H_3O^+$$?

Accepted Answer

$$K_a = \frac{[A^-][H_3O^+]}{[HA]}$$

Question 6

If the $$pK_a of $$acetic acid is $$4.76$$, what is the $$K_a$$ value?

Accepted Answer

$$K_a = 1.7 	imes 10$$^{-5}$$

Question 7

Which of the following statements is true regarding $$pK_a$$ and acid strength?

Accepted Answer

A small $$pK_a$$ value indicates a strong acid

Question 8

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

Accepted Answer

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

Question 9

A solution has $$[H^+] = 1 	imes 10$$^{-3}$$ M. What is its pH$?

Accepted Answer

$$pH = 3$$

Question 10

Which of the following organic compounds is the strongest acid?

Accepted Answer

Acetic acid ($$CH_3COOH)$$

Question 11

What is the $$pK_a$$ range for most carboxylic acids?

Accepted Answer

$$3-5$$

Question 12

Which of the following is a correct statement about equilibrium in acid-base reactions?

Accepted Answer

Equilibrium favors the formation of the weaker acid and weaker base

Question 13

Which of the following is the conjugate acid of $$NH_3$$?

Accepted Answer

$$NH_4$$^+$$

Question 14

What is the $$pK_a of $$methanol ($$CH_3OH$$)?

Accepted Answer

$$15.5$$

Question 15

Which of the following best explains why carboxylic acids are more acidic than alcohols?

Accepted Answer

Carboxylic acids have resonance stabilization of their conjugate base

Question 16

If $$K_a 	imes K_b = 1 	imes 10$$^{-14}$$, what is the sum of pK_a$ and pK_b$?

Accepted Answer

$$14$$

Question 17

Which of the following species is the conjugate base of acetic acid ($$CH_3COOH$$)?

Accepted Answer

$$CH_3COO^-$$

Question 18

Which of the following is true about the $$pK_a of $$amines?

Accepted Answer

$$pK_a \u003e 30$$

Question 19

Which of the following is a correct statement about $$pH$$ and acidity?

Accepted Answer

Low $$pH$$ indicates an acidic solution

Acids and Bases in Organic Chemistry: Concepts, Strength, and Examples

Guida di studio - Domande di pratica