Question 1

What mass of $(NH_4)_3PO_4$ is required to prepare 500.0 mL of a 0.100 M solution? (Molar mass of $(NH_4)_3PO_4 = 149.09$ g/mol)

Accepted Answer

$7.45$ g

Question 2

Which of the following solutions will have the lowest ion concentration if each is 0.10 M?

Accepted Answer

$0.10$ M $H_3PO_4$

Question 3

A student needs to prepare 250.0 mL of 0.10 M HCl from a 6.0 M stock solution. What volume of the stock solution is required?

Accepted Answer

$4.2$ mL

Question 4

When 100.0 mL of 0.300 M $(NH_4)_2CrO_4$ and 50.0 mL of 0.500 M $(NH_4)_3PO_4$ are mixed, what is the final concentration of $NH_4^+$ ions?

Accepted Answer

$0.467$ M

Question 5

Which of the following is a strong electrolyte?

Accepted Answer

Sodium chloride ($NaCl$)

Question 6

Which statement best describes a weak acid in water?

Accepted Answer

It partially dissociates, resulting in a small number of ions in solution.

Question 7

What is the total ion concentration in a 2.0 M $(NH_4)_3PO_4$ solution, assuming complete dissociation?

Accepted Answer

$6.0$ M

Question 8

Which of the following is NOT a strong acid?

Accepted Answer

$CH_3COOH$

Question 9

In the reaction $2 MnO_4^- + 5 H_2O_2 + 6 H^+ \rightarrow 2 Mn^{2+} + 5 O_2 + 8 H_2O$, if you start with 13.5 mL of 0.100 M $MnO_4^-$, 20.0 mL of 0.150 M $H_2O_2$, and 50.0 mL of 6.00 M HCl, which reactant is the limiting reagent?

Accepted Answer

$H_2O_2$

Question 10

Which of the following best explains why ionic compounds conduct electricity when dissolved in water?

Accepted Answer

The ions dissociate and move freely in solution.

Question 11

Which equation correctly represents the dilution of a solution?

Accepted Answer

$M_1V_1 = M_2V_2$

Question 12

Which of the following is true about strong acids?

Accepted Answer

They completely ionize in water.

Question 13

What is the main difference between a strong acid and a weak acid in solution?

Accepted Answer

Strong acids produce a large number of ions; weak acids produce few ions.

Question 14

Which of the following is a weak electrolyte?

Accepted Answer

Acetic acid ($CH_3COOH$)

Question 15

If 100.0 mL of 0.300 M $(NH_4)_2CrO_4$ is mixed with 50.0 mL of 0.500 M $(NH_4)_3PO_4$, what is the final concentration of $PO_4^{3-}$ ions?

Accepted Answer

$0.167$ M

Question 16

Which of the following best describes a non-electrolyte?

Accepted Answer

A substance that does not produce ions in solution.

Question 17

Which of the following is NOT a property of strong electrolytes?

Accepted Answer

They remain mostly as molecules in solution.

Question 18

What is the molarity of $H^+$ ions in a 0.10 M $HCl$ solution?

Accepted Answer

$0.10$ M

Question 19

Which of the following is a correct statement about the behavior of sugar ($C_6H_{12}O_6$) in water?

Accepted Answer

It dissolves but does not dissociate into ions.

Question 20

Which of the following is the correct formula for calculating moles from molarity and volume?

Accepted Answer

$	ext{moles} = M 	imes V$

Solutions, Dilutions, and Electrolytes in General Chemistry

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