Q: Which of the following is the correct formula for calculating molarity?

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

Question 1

Which of the following best describes a solution in chemistry?

Accepted Answer

A homogeneous mixture in which the solute is evenly distributed within the solvent.

Question 2

A student prepares a solution by dissolving $$25.5\ \mathrm{g} of $$KBr in enough water to make $$1.75\ \mathrm{L} of $$solution. What is the molarity of the solution? (Molar mass of KBr = $$119.0\ \mathrm{g/mol})$$

Accepted Answer

$$0.122\ \mathrm{M}$$

Question 3

Which of the following statements about electrolytes is correct?

Accepted Answer

Electrolytes are substances that dissolve in water to form ions and conduct electricity.

Question 4

How many liters of a $$0.125\ \mathrm{M}$$ NaOH solution are required to provide $$0.255\ \mathrm{mol}$$ NaOH?

Accepted Answer

$$2.04\ \mathrm{L}$$

Question 5

A laboratory technician needs to prepare $$500\ \mathrm{mL} of$$ $$0.100\ \mathrm{M}$$ HNO$$_3$$ from a $$15.9\ \mathrm{M}$$ stock solution. What volume of the concentrated HNO$$_3$$ should be used?

Accepted Answer

$$3.14\ \mathrm{mL}$$

Question 6

Which of the following equations correctly represents the dissociation of Na$$_2SO$_4 in $$water?

Accepted Answer

$$\mathrm{Na}_2\mathrm{SO}_4(aq) \rightarrow 2\ \mathrm{Na}^+(aq) + \mathrm{SO}_4$$^{2-}$$(aq)$$

Question 7

Which of the following is a strong acid according to the study materials?

Accepted Answer

Hydrochloric acid, HCl

Question 8

A solution is prepared by diluting $$10.0\ \mathrm{mL} of$$ $$6.00\ \mathrm{M}$$ HCl to a final volume of $$250.0\ \mathrm{mL}. $$What is the final concentration of HCl?

Accepted Answer

$$0.240\ \mathrm{M}$$

Question 9

Which of the following best explains why sugar (C$$_{12}H$_{22}O$_{11}) $$does not conduct electricity when dissolved in water?

Accepted Answer

Sugar molecules do not dissociate into ions in water.

Question 10

Which of the following statements about acids and bases is correct according to the Arrhenius definition?

Accepted Answer

Acids produce H$$^+$$ ions in aqueous solution, while bases produce OH$$^-$$ ions.

Question 11

A reaction between KCl(aq) and Pb(NO$$_3$$)$$_2(aq) $$produces PbCl$$_2(s) $$and KNO$$_3(aq). If$$ $$0.150\ \mathrm{L} of$$ $$0.175\ \mathrm{M} Pb(NO$_3$$)$$_2 is $$completely reacted, what mass of PbCl$$_2 ($$molar mass = $$278.1\ \mathrm{g/mol}) is $$produced?

Accepted Answer

$$7.30\ \mathrm{g}$$

Question 12

Which of the following is an example of a weak base?

Accepted Answer

NH$$_3$$

Question 13

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

Accepted Answer

$$\mathrm{H}^+(aq) + \mathrm{OH}^-(aq) \rightarrow \mathrm{H}_2\mathrm{O}(l)$$

Question 14

Which of the following best describes the process of dissociation?

Accepted Answer

The separation of ions from an ionic compound as it dissolves in water.

Question 15

A $$100.0\ \mathrm{mL}$$ sample of $$0.200\ \mathrm{M}$$ KOH is mixed with $$200.0\ \mathrm{mL} of$$ $$0.175\ \mathrm{M}$$ NiSO$$_4. $$What is the limiting reagent?

Accepted Answer

KOH

Question 16

Which of the following statements about water is true according to the study materials?

Accepted Answer

Water is amphoteric, meaning it can act as both an acid and a base.

Question 17

Which of the following is the correct formula for calculating molarity?

Accepted Answer

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

Question 18

Which of the following is a property of a strong base?

Accepted Answer

It is present in aqueous solution entirely as ions, including OH$$^-.$$

Question 19

Which of the following best describes a concentrated solution?

Accepted Answer

A solution with a high solute concentration.

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

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