Question 1

Which salt shown in the solubility graph has the LEAST change in solubility with increasing temperature between 0°C and 100°C?

Accepted Answer

NaCl

Question 2

Based on the solubility curves, which compound would precipitate first if a saturated solution at 80°C is cooled to 20°C?

Accepted Answer

KNO3

Question 3

According to the solubility graph, which salt has the highest solubility at 100°C?

Accepted Answer

NaNO3

Question 4

If you dissolve 40 g of KNO3 in 100 g of water at 30°C and then cool the solution to 0°C, approximately how many grams of KNO3 will precipitate out? (Use the solubility curve.)

Accepted Answer

$$\approx 31 g$$

Question 5

Which compound's solubility decreases as temperature increases, according to the solubility graph?

Accepted Answer

Ce$$_2(SO$_4$$)$$_3$$

Question 6

Given the linear plot of $$1/[AB]$$ versus time for the reaction $$AB \rightarrow A + B$$, what is the order of the reaction with respect to $$AB$$?

Accepted Answer

Second order

Question 7

Using the equation from the plot $$y = 0.0225x + 1.059$$, what is the rate constant $$k$$ for the reaction $$AB \rightarrow A + B$$?

Accepted Answer

$$k = 0.0225\ \mathrm{M}^{-1}\mathrm{s}^{-1}$$

Question 8

If the initial concentration of $$[AB] is$$ $$0.950\ \mathrm{M}$$, what is the concentration of $$[AB]$$ after $$300\ \mathrm{s}$$ using the plot $$y = 0.0225x + 1.059$$?

Accepted Answer

$$[AB] = 0.128\ \mathrm{M}$$

Question 9

For the reaction $$AB \rightarrow A + B$$, if the plot of $$1/[AB]$$ versus time is linear, what is the integrated rate law for this reaction?

Accepted Answer

$$\frac{1}{[AB]} = kt + \frac{1}{[AB]_0}$$

Question 10

If the rate constant $$k$$ for a second-order reaction is $$0.0225\ \mathrm{M}^{-1}\mathrm{s}^{-1}$$, what is the half-life $$t_{1/2}$$ for an initial concentration $$[AB]_0 = 0.950\ \mathrm{M}$$?

Accepted Answer

$$t_{1/2} = \frac{1}{k[AB]_0} = 47.0\ \mathrm{s}$$

Question 11

If you want to maximize the amount of KNO$$_3$$ that can be dissolved in water, at which temperature should you operate according to the solubility graph?

Accepted Answer

100°C

Question 12

Which salt would be most suitable for a precipitation reaction that requires minimal solubility change with temperature?

Accepted Answer

NaCl

General Chemistry: Solutions, Solubility, and Kinetics Study Guide

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