Q: Which of the following is the correct acid dissociation reaction for glyoxylic acid, $\mathrm{HCOCO}_2\mathrm{H}$?

$\mathrm{HCOCO}_2\mathrm{H} + \mathrm{H}_2\mathrm{O} \rightarrow \mathrm{HCOCO}_2^- + \mathrm{H}_3\mathrm{O}^+$

Q: Given the acid dissociation constants $K_a$ for the following acids: $K_a = 1.4 \times 10^{-3}$ for $\mathrm{HClO}_2$, $K_a = 1.4 \times 10^{-4}$ for $\mathrm{HClO}$, and $K_a = 1.3 \times 10^{-5}$ for $\mathrm{HClO}_3$, which of the following will be the weakest base?

Conjugate base of $\mathrm{HClO}_3$

Q: What is the balanced net ionic equation for the reaction: $\mathrm{Cr(ClO_4)_3}(aq) + \mathrm{KOH}(aq) \rightarrow \mathrm{K[Cr(OH)_6]}(aq) + \mathrm{KClO_4}(aq)$?

$\mathrm{Cr^{3+}}(aq) + 6\mathrm{OH}^-(aq) \rightarrow \mathrm{[Cr(OH)_6]^{3-}}(aq)$

Q: Which of the following is the correct formula for wine lactone, given the structure shown?

$\mathrm{C}_8\mathrm{H}_{14}\mathrm{O}_2$

Question 1

For the reaction $2\mathrm{SO}_2(g) + \mathrm{O}_2(g) \rightarrow 2\mathrm{SO}_3(g)$, what is the correct reaction quotient $Q$ expression in terms of partial pressures?

Accepted Answer

$Q = \dfrac{P_{\mathrm{SO}_3}^2}{P_{\mathrm{SO}_2}^2 P_{\mathrm{O}_2}}$

Question 2

A reaction vessel at 830 K contains $0.10$ atm $\mathrm{SO}_2$, $0.40$ atm $\mathrm{SO}_3$, and $0.50$ atm $\mathrm{O}_2$. Given $K_p = 7.7$ at 830 K for $2\mathrm{SO}_2(g) + \mathrm{O}_2(g) \rightleftharpoons 2\mathrm{SO}_3(g)$, in which direction will the reaction proceed to reach equilibrium?

Accepted Answer

To the right, since $Q < K_p$

Question 3

Which of the following is the correct acid dissociation reaction for glyoxylic acid, $\mathrm{HCOCO}_2\mathrm{H}$?

Accepted Answer

$\mathrm{HCOCO}_2\mathrm{H} + \mathrm{H}_2\mathrm{O} \rightarrow \mathrm{HCOCO}_2^- + \mathrm{H}_3\mathrm{O}^+$

Question 4

What is the pH of a $0.25$ M solution of glyoxylic acid, $\mathrm{HCOCO}_2\mathrm{H}$, if $K_a = 3.5 	imes 10^{-4}$?

Accepted Answer

$1.42$

Question 5

Which of the following structures CANNOT possibly be a reasonable Lewis structure for $\mathrm{C}_2\mathrm{H}_6\mathrm{O}$?

Accepted Answer

Structure (c)

Question 6

How are structures (a) and (b) in the previous question related to each other?

Accepted Answer

They are different compounds.

Question 7

Which of the following is a good 3D representation of the adjacent organic compound (lactone)?

Accepted Answer

Structure (c)

Question 8

Which of the following is a reasonable Lewis structure for $\mathrm{BrCl}_3$?

Accepted Answer

Structure (b)

Question 9

Which one of the structures for $\mathrm{BrCl}_3$ has Br with a $+3$ formal charge?

Accepted Answer

Structure (e)

Question 10

Given the acid dissociation constants $K_a$ for the following acids: $K_a = 1.4 	imes 10^{-3}$ for $\mathrm{HClO}_2$, $K_a = 1.4 	imes 10^{-4}$ for $\mathrm{HClO}$, and $K_a = 1.3 	imes 10^{-5}$ for $\mathrm{HClO}_3$, which of the following will be the weakest base?

Accepted Answer

Conjugate base of $\mathrm{HClO}_3$

Question 11

A solution is prepared by dissolving $5.00$ g of a weak base B ($K_b = 1.6 	imes 10^{-6}$) in $75.0$ mL of water. The pH of the solution is $10.73$. What is the molecular weight of B?

Accepted Answer

$78.3$ g/mol

Question 12

What is the balanced net ionic equation for the reaction: $\mathrm{Cr(ClO_4)_3}(aq) + \mathrm{KOH}(aq) \rightarrow \mathrm{K[Cr(OH)_6]}(aq) + \mathrm{KClO_4}(aq)$?

Accepted Answer

$\mathrm{Cr^{3+}}(aq) + 6\mathrm{OH}^-(aq) \rightarrow \mathrm{[Cr(OH)_6]^{3-}}(aq)$

Question 13

If $25.0$ mL of $0.036$ M $\mathrm{Cr(ClO_4)_3}$ is mixed with $75.0$ mL of $0.045$ M $\mathrm{KOH}$, how many moles of $\mathrm{K[Cr(OH)_6]}$ will be made assuming the reaction goes to completion?

Accepted Answer

$7.2 	imes 10^{-4}$ mol

Question 14

What is the $[OH^-]$ to the correct number of significant figures in a pH $12.479$ aqueous solution?

Accepted Answer

$3.3189 	imes 10^{-2}$ M

Question 15

If $5.0$ mL of a $0.050$ M aqueous solution of HI is diluted to $125.0$ mL, what is the pH of the resulting solution?

Accepted Answer

$2.70$

Question 16

Which of the following is the correct formula for wine lactone, given the structure shown?

Accepted Answer

$\mathrm{C}_8\mathrm{H}_{14}\mathrm{O}_2$

Question 17

Which of the following would you need to prepare $500$ mL of a pH $10.75$ aqueous solution?

Accepted Answer

$0.036$ g HI

Question 18

Consider the following acid-base reaction: $2$ acid-base pairs are involved. Which are they? (Answer in the format: acid/base, acid/base)

Accepted Answer

(1/2) and (3/4)

Question 19

Given the equilibrium constant for the acid-base reaction is $2 	imes 10^{-4}$ at $25^\circ$C, which compound is the strongest acid in the reaction?

Accepted Answer

Compound 1

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