Question 1

A laboratory technician dissolves 12.0 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 NaCl solution?

Accepted Answer

$$0.411\ \mathrm{M}$$

Question 2

How many grams of KNO$$_3 ($$molar mass = 101.1 g/mol) are present in 250.0 mL of a 0.600 M KNO$$_3$$ solution?

Accepted Answer

$$15.2\ \mathrm{g}$$

Question 3

Which of the following is the correct technique for preparing 1.00 L of 1.00 M H$$_2SO$_4$$ solution from concentrated acid (18.0 M)?

Accepted Answer

Add about 56 mL of concentrated H$$_2SO$_4$$ slowly to about 900 mL of water, mix, then dilute to 1.00 L.

Question 4

A student dilutes 50.0 mL of 2.00 M NaOH to a final volume of 200.0 mL. What is the final concentration?

Accepted Answer

$$0.500\ \mathrm{M}$$

Question 5

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

Accepted Answer

NaCl

Question 6

What is the concentration of chloride ions in a 0.200 M solution of CaCl$$_2$$?

Accepted Answer

$$0.400\ \mathrm{M}$$

Question 7

Which of the following reactions is a precipitation reaction?

Accepted Answer

$$\mathrm{$$AgNO_3$$(aq) + NaCl(aq) \rightarrow AgCl(s) + $$NaNO_3$$(aq)}$$

Question 8

Given the reaction: $$\mathrm{Pb(NO_3$)_2(aq) + 2KI(aq) \rightarrow $$PbI_2$$(s) + 2KNO_3(aq)}$$, what is the net ionic equation?

Accepted Answer

$$\mathrm{Pb$$^{2+}$$(aq) + 2I^-(aq) \rightarrow $$PbI_2$$(s)}$$

Question 9

Which compound is insoluble in water according to solubility guidelines?

Accepted Answer

BaSO$$_4$$

Question 10

Which of the following acids is correctly classified as a strong acid?

Accepted Answer

HNO$$_3$$

Question 11

What is the net ionic equation for the reaction between HCl(aq) and NaOH(aq)?

Accepted Answer

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

Question 12

How many moles of H$$_2SO$_4$$ are required to neutralize 0.300 mol of NaOH?

Accepted Answer

$$0.150$$

Question 13

A titration requires 25.00 mL of 0.100 M HCl to neutralize 30.00 mL of NaOH solution. What is the concentration of the NaOH solution?

Accepted Answer

$$0.0833\ \mathrm{M}$$

Question 14

Assign the oxidation number to sulfur in H$$_2SO$_4.$$

Accepted Answer

$$+6$$

Question 15

Which species is the oxidizing agent in the reaction: $$\mathrm{Zn(s) + Cu$$^{2+}$$(aq) \rightarrow Zn$$^{2+}$$(aq) + Cu(s)}$$?

Accepted Answer

$$\mathrm{Cu$$^{2+}$$}$$

Question 16

Which of the following metals will react with 1.0 M HCl to produce H$$_2$$ gas? (Use the activity series.)

Accepted Answer

Mg

Question 17

A student is given experimental data showing that Fe reacts with CuSO$$_4$$ but not with ZnSO$$_4. $$What is the correct order in the activity series for these three metals?

Accepted Answer

Zn \u003e Fe \u003e Cu

Question 18

In a redox titration, 0.0250 mol of KMnO$$_4 is $$required to completely react with an unknown amount of Fe$$^{2+} in $$solution. If the reaction is $$5\mathrm{Fe$$^{2+}$$ + $$MnO_4$$^- + 8H^+ \rightarrow 5Fe$$^{3+}$$ + Mn$$^{2+}$$ + 4H_2O}$$, how many moles of Fe$$^{2+}$$ were present?

Accepted Answer

$$0.125\ \mathrm{mol}$$

Question 19

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

Accepted Answer

H$$_3PO$_4$$

Reactions in Aqueous Solution: Molarity, Solution Preparation, and Types of Chemical Reactions

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