Q: Which of the following is the correct formula for calculating molarity ($$M$$)?

$$M = \dfrac{\text{amount of solute (mol)}}{\text{volume of solution (L)}}$$

Question 1

Which of the following best describes an aqueous solution?

Accepted Answer

A solution in which water is the solvent.

Question 2

A student prepares a solution by dissolving 10.0 g of NaCl in enough water to make 500 mL of solution. What is the molarity of the solution? (Molar mass of NaCl = 58.44 g/mol)

Accepted Answer

$$0.342\ \mathrm{M}$$

Question 3

Which of the following statements about concentrated and dilute solutions is correct?

Accepted Answer

A dilute solution contains a small amount of solute compared to solvent.

Question 4

How many moles of solute are required to make $$2.0\ \mathrm{L} of a$$ $$0.50\ \mathrm{M}$$ solution?

Accepted Answer

$$1.0\ \mathrm{mol}$$

Question 5

A laboratory technician needs to prepare $$250\ \mathrm{mL} of a$$ $$1.50\ \mathrm{M}$$ KBr solution. What mass of KBr (molar mass = $$119.00\ \mathrm{g/mol}) is $$required?

Accepted Answer

$$44.6\ \mathrm{g}$$

Question 6

Which of the following is the correct formula for calculating molarity ($$M$$)?

Accepted Answer

$$M = \dfrac{	ext{amount of solute (mol)}}{	ext{volume of solution (L)}}$$

Question 7

If you dilute $$0.200\ \mathrm{L} of a$$ $$15.0\ \mathrm{M}$$ NaOH stock solution to a final concentration of $$3.00\ \mathrm{M}$$, what is the final volume of the solution?

Accepted Answer

$$1.00\ \mathrm{L}$$

Question 8

A $$0.125\ \mathrm{M}$$ NaOH solution contains how many moles of NaOH in $$2.00\ \mathrm{L} of $$solution?

Accepted Answer

$$0.250\ \mathrm{mol}$$

Question 9

Which of the following ions, when present in a compound, guarantees that the compound is soluble in water with no exceptions?

Accepted Answer

$$\mathrm{NO}_3^-$$

Question 10

Which of the following compounds is insoluble in water?

Accepted Answer

$$\mathrm{BaSO}_4$$

Question 11

When solutions of $$\mathrm{K_2CO_3}$$ and $$\mathrm{$$NiCl_2$$}$$ are mixed, which product will precipitate?

Accepted Answer

$$\mathrm{NiCO}_3$$

Question 12

Which of the following is a strong electrolyte?

Accepted Answer

$$\mathrm{KBr}$$

Question 13

What is the net ionic equation for the reaction between aqueous $$\mathrm{HCl}$$ and aqueous $$\mathrm{NaOH}$$?

Accepted Answer

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

Question 14

A $$10.00\ \mathrm{mL}$$ sample of $$0.200\ \mathrm{M}$$ HBr is titrated with $$0.200\ \mathrm{M}$$ NaOH. What volume of NaOH is required to reach the equivalence point?

Accepted Answer

$$10.00\ \mathrm{mL}$$

Question 15

Which of the following is the correct net ionic equation for the gas-evolution reaction between $$\mathrm{$$HNO_3$$}(aq)$$ and $$\mathrm{Na_2CO_3}(aq)$$?

Accepted Answer

$$2\ \mathrm{H}^+(aq) + \mathrm{CO_3$}^{2-}(aq) \rightarrow \mathrm{H_2O}(l) + \mathrm{CO_2$}(g)$$

Question 16

Assign the oxidation state to sulfur in $$\mathrm{SO_4$^{2-}}.$$

Accepted Answer

$$+6$$

Question 17

Which of the following reactions is a redox reaction?

Accepted Answer

$$2\ \mathrm{Mg}(s) + \mathrm{O_2$}(g) \rightarrow 2\ \mathrm{MgO}(s)$$

Question 18

In the reaction $$2\ \mathrm{Na}(s) + \mathrm{Cl_2$}(g) \rightarrow 2\ \mathrm{NaCl}(s)$$, which species is the reducing agent?

Accepted Answer

$$\mathrm{Na}(s)$$

Question 19

According to the activity series, which metal is most easily oxidized?

Accepted Answer

$$\mathrm{K}$$

Introduction to Solutions and Aqueous Reactions: Solution Concentration and Molarity

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