Q: A student prepares 250 mL of a 0.200 M NaCl solution. How many grams of NaCl are required? (Molar mass of NaCl = 58.44 g/mol)

$$0.200 \times 0.250 \times 58.44 = 2.92 g$$

Q: A 50.0 mL sample of 0.100 M H2SO4 is titrated with 0.200 M NaOH. What volume of NaOH is required to reach the equivalence point?

$$V_{NaOH} = \frac{0.0500 \times 0.100 \times 2}{0.200} = 0.0500 L$$

Q: A solution is prepared by diluting 20.0 mL of 6.00 M HCl to a final volume of 250.0 mL. What is the final concentration?

$$M_2$$ = \frac{6.00 \times 20.0}{250.0} = 0.480$$ M

Q: A student mixes 100.0 mL of 0.200 M Na2SO4 with 100.0 mL of 0.200 M Ba(NO3)2. What mass of BaSO4 precipitate forms? (Molar mass BaSO4 = 233.4 g/mol)

$$\text{Moles of BaSO}_4 = 0.100 \times 0.200 = 0.0200$$ mol; \text{Mass} = 0.0200 \times 233.4 = 4.67$ g

Q: Which of the following is the correct calculation for the molarity of a solution made by dissolving 5.00 g of KNO3 (molar mass = 101.1 g/mol) in enough water to make 250.0 mL of solution?

$$M = \frac{5.00}{101.1 \times 0.250} = 0.198 M$$

Question 1

Which of the following compounds will form a precipitate when mixed with an aqueous solution of Na2CO3?

Accepted Answer

BaCl2

Question 2

A student prepares 250 mL of a 0.200 M NaCl solution. How many grams of NaCl are required? (Molar mass of NaCl = 58.44 g/mol)

Accepted Answer

$$0.200 	imes 0.250 	imes 58.44 = 2.92 g$$

Question 3

Which of the following is a strong electrolyte in aqueous solution?

Accepted Answer

HNO3

Question 4

What is the net ionic equation for the reaction between aqueous solutions of HCl and NaOH?

Accepted Answer

$$\mathrm{H^+ (aq) + OH^- (aq) \rightarrow H_2O (l)}$$

Question 5

A 50.0 mL sample of 0.100 M H2SO4 is titrated with 0.200 M NaOH. What volume of NaOH is required to reach the equivalence point?

Accepted Answer

$$V_{NaOH} = \frac{0.0500 	imes 0.100 	imes 2}{0.200} = 0.0500 L$$

Question 6

Which of the following statements about solubility rules is correct?

Accepted Answer

All carbonates are soluble except those of alkali metals and NH4+

Question 7

What is the oxidation number of sulfur in $$\mathrm{H_2SO_4}$$?

Accepted Answer

$$+6$$

Question 8

Which of the following is the correct balanced net ionic equation for the precipitation reaction between AgNO3(aq) and NaCl(aq)?

Accepted Answer

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

Question 9

A solution is prepared by diluting 20.0 mL of 6.00 M HCl to a final volume of 250.0 mL. What is the final concentration?

Accepted Answer

$$M_2$$ = \frac{6.00 	imes 20.0}{250.0} = 0.480$$ M

Question 10

Which of the following is NOT a strong acid?

Accepted Answer

HF

Question 11

In the reaction $$\mathrm{Zn (s) + 2HCl (aq) \rightarrow $$ZnCl_2$$ (aq) + H_2$ (g)}$$, which species is oxidized?

Accepted Answer

Zn

Question 12

Which of the following best describes a non-electrolyte?

Accepted Answer

A substance that does not conduct electricity when dissolved in water

Question 13

A student mixes 100.0 mL of 0.200 M Na2SO4 with 100.0 mL of 0.200 M Ba(NO3)2. What mass of BaSO4 precipitate forms? (Molar mass BaSO4 = 233.4 g/mol)

Accepted Answer

$$	ext{Moles of BaSO}_4 = 0.100 	imes 0.200 = 0.0200$$ mol; 	ext{Mass} = 0.0200 	imes 233.4 = 4.67$ g

Question 14

Which of the following is the correct sequence for balancing a redox equation in acidic solution?

Accepted Answer

Balance atoms, balance O with $$\mathrm{H_2O}$$, balance H with $$\mathrm{H^+}$$, balance charge with $$\mathrm{e^-}$$

Question 15

Which of the following pairs will NOT produce a gas when mixed?

Accepted Answer

NaCl and H2SO4

Question 16

A solution contains 0.10 M NaNO3 and 0.10 M AgNO3. Which ion will NOT be present in the net ionic equation if NaCl is added and a precipitate forms?

Accepted Answer

$$\mathrm{NO_3$^-}$$

Question 17

Which of the following is the correct calculation for the molarity of a solution made by dissolving 5.00 g of KNO3 (molar mass = 101.1 g/mol) in enough water to make 250.0 mL of solution?

Accepted Answer

$$M = \frac{5.00}{101.1 	imes 0.250} = 0.198 M$$

Question 18

Which of the following is a weak electrolyte?

Accepted Answer

HF

Question 19

Which of the following best describes the role of the solvent in a solution?

Accepted Answer

It is present in the largest amount and dissolves the solute

Chapter 5: Introduction to Solutions and Aqueous Solutions – Study Notes

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