Q: A solution is prepared by dissolving 10.0 g of NaCl (molar mass = 58.44 g/mol) in enough water to make 500.0 mL of solution. What is the molarity of the solution?

$$M = \frac{10.0\ \text{g}}{58.44\ \text{g/mol}} \div 0.500\ \text{L} = 0.342\ \text{M}$$

Q: How many grams of glucose (C$$_6H$_{12}O$_6$$, molar mass = 180.2 g/mol) are needed to prepare 1.50 L of a 0.250 M solution?

$$\text{mass} = 1.50\ \text{L} \times 0.250\ \text{mol/L} \times 180.2\ \text{g/mol} = 67.6\ \text{g}$$

Q: A medical test requires 25 mg of cholesterol (C$$_{27}H$_{46}O$$, molar mass = 386.7 g/mol). If the concentration of cholesterol in blood is 0.0050 M, how many mL of blood are required?

$$\text{mL} = \frac{0.025\ \text{g}}{386.7\ \text{g/mol}} \div 0.0050\ \text{mol/L} \times 1000 = 13\ \text{mL}$$

Q: What is the concentration of chloride ions in a 0.20 M solution of CaCl$$_2$$?

$$[Cl^-] = 0.20\ \text{M} \times 2 = 0.40\ \text{M}$$

Q: A 50.0 mL sample of 0.100 M HCl is titrated with 0.200 M NaOH. What volume of NaOH is required to reach the equivalence point?

$$V_{NaOH} = \frac{0.0500\ \text{L} \times 0.100\ \text{mol/L}}{0.200\ \text{mol/L}} = 0.0250\ \text{L} = 25.0\ \text{mL}$$

Question 1

A solution is prepared by dissolving 10.0 g of NaCl (molar mass = 58.44 g/mol) in enough water to make 500.0 mL of solution. What is the molarity of the solution?

Accepted Answer

$$M = \frac{10.0\ 	ext{g}}{58.44\ 	ext{g/mol}} \div 0.500\ 	ext{L} = 0.342\ 	ext{M}$$

Question 2

How many grams of glucose (C$$_6H$_{12}O$_6$$, molar mass = 180.2 g/mol) are needed to prepare 1.50 L of a 0.250 M solution?

Accepted Answer

$$	ext{mass} = 1.50\ 	ext{L} 	imes 0.250\ 	ext{mol/L} 	imes 180.2\ 	ext{g/mol} = 67.6\ 	ext{g}$$

Question 3

A medical test requires 25 mg of cholesterol (C$$_{27}H$_{46}O$$, molar mass = 386.7 g/mol). If the concentration of cholesterol in blood is 0.0050 M, how many mL of blood are required?

Accepted Answer

$$	ext{mL} = \frac{0.025\ 	ext{g}}{386.7\ 	ext{g/mol}} \div 0.0050\ 	ext{mol/L} 	imes 1000 = 13\ 	ext{mL}$$

Question 4

Which of the following is a strong electrolyte?

Accepted Answer

NaCl (sodium chloride)

Question 5

What is the concentration of chloride ions in a 0.20 M solution of CaCl$$_2$$?

Accepted Answer

$$[Cl^-] = 0.20\ 	ext{M} 	imes 2 = 0.40\ 	ext{M}$$

Question 6

Which of the following reactions is a precipitation reaction?

Accepted Answer

Mixing aqueous solutions of Na$$_2SO$_4$$ and BaCl$$_2 to $$form BaSO$$_4 (s)$$

Question 7

Which compound is insoluble in water according to the solubility guidelines?

Accepted Answer

BaSO$$_4$$

Question 8

What is the net ionic equation for the reaction between Na$$_2SO$_4 (aq) $$and BaCl$$_2 (aq$$)?

Accepted Answer

$$Ba^{2+} (aq$$) + $$SO_4$$^{2-} (aq) \rightarrow $$BaSO_4 (s$$)$$

Question 9

Which of the following acids is a strong acid?

Accepted Answer

HNO$$_3 ($$nitric acid)

Question 10

What is the formula for the oxoacid whose anion is the sulfate ion?

Accepted Answer

H$$_2SO$_4$$

Question 11

Which of the following bases is classified as a strong base?

Accepted Answer

KOH (potassium hydroxide)

Question 12

A 50.0 mL sample of 0.100 M HCl is titrated with 0.200 M NaOH. What volume of NaOH is required to reach the equivalence point?

Accepted Answer

$$V_{NaOH} = \frac{0.0500\ 	ext{L} 	imes 0.100\ 	ext{mol/L}}{0.200\ 	ext{mol/L}} = 0.0250\ 	ext{L} = 25.0\ 	ext{mL}$$

Question 13

Which of the following is the correct total ionic equation for the reaction of HCl (aq) with NaOH (aq)?

Accepted Answer

$$H^+ (aq) + Cl^- (aq) + Na^+ (aq) + OH^- (aq) \rightarrow Na^+ (aq) + Cl^- (aq) + H_2O (l)$$

Question 14

Which of the following compounds is most likely to be insoluble in water?

Accepted Answer

AgCl

Question 15

Which of the following is the correct net ionic equation for the reaction between AgNO$$_3 (aq) $$and NaCl (aq)?

Accepted Answer

$$Ag^+ (aq) + Cl^- (aq) \rightarrow AgCl (s)$$

Question 16

Which of the following is a weak acid?

Accepted Answer

HF (hydrofluoric acid)

Question 17

Which of the following is the correct formula for nitrous acid?

Accepted Answer

HNO$$_2$$

Question 18

Which of the following statements best describes a nonelectrolyte?

Accepted Answer

A substance that dissolves in water but does not produce ions

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