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

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

Question 1

Which of the following best describes a solution?

Accepted Answer

A homogenous mixture of two or more substances

Question 2

What is the molarity of a solution prepared by dissolving 25.5 g of KBr (molar mass = 119.0 g/mol) in enough water to make 1.75 L of solution?

Accepted Answer

$$0.122\ mol/L$$

Question 3

Which of the following statements about electrolytes is TRUE?

Accepted Answer

Strong electrolytes conduct electricity well because they dissociate completely into ions

Question 4

How many grams of KBr (molar mass = 119.0 g/mol) are needed to prepare 250.0 mL of a 1.50 M KBr solution?

Accepted Answer

$$44.6\ g$$

Question 5

A laboratory procedure requires 3.00 L of a 0.500 M CaCl$$_2$$ solution. How much of a 10.0 M stock solution should be diluted to make this solution?

Accepted Answer

$$0.150\ L$$

Question 6

Which of the following compounds is a nonelectrolyte when dissolved in water?

Accepted Answer

C$$_{12}H$_{22}O$_{11} ($$sucrose)

Question 7

Which of the following best explains why NaCl conducts electricity when dissolved in water?

Accepted Answer

NaCl dissociates into Na$$^+$$ and Cl$$^-$$ ions, which carry charge

Question 8

A student needs to prepare 1.00 L of a 3.00 M NaOH solution from a 15.0 M stock solution. What volume of the stock solution is required?

Accepted Answer

$$0.200\ L$$

Question 9

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

Accepted Answer

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

Question 10

Which of the following compounds is insoluble in water according to the solubility rules?

Accepted Answer

PbCl$$_2$$

Question 11

A reaction requires 0.255 mol of NaOH. How many liters of a 0.125 M NaOH solution are needed?

Accepted Answer

$$2.04\ L$$

Question 12

Which of the following best describes a strong acid in aqueous solution?

Accepted Answer

It completely ionizes in water

Question 13

How many grams of sucrose (C$$_{12}H$_{22}O$_{11}$$, molar mass = 342 g/mol) are in 1.55 L of a 0.758 M sucrose solution?

Accepted Answer

$$402\ g$$

Question 14

Which of the following is a correct application of the dilution equation $$M_1V_1 = M_2V_2$$?

Accepted Answer

To determine the volume of stock solution needed to prepare a diluted solution

Question 15

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

Accepted Answer

It does not dissociate into ions in water

Question 16

A solution is prepared by mixing 0.150 L of 10.0 M HCl with enough water to make 3.00 L of solution. What is the final concentration?

Accepted Answer

$$0.500\ M$$

Question 17

Which of the following ions, when paired with Cl$$^-$$, will form an insoluble compound in water?

Accepted Answer

Pb$$^{2+}$$

Question 18

In a reaction between 0.150 L of 0.175 M Pb(NO$$_3$$)$$_2$$ and KCl, how many liters of 0.150 M KCl are required to completely react with the Pb(NO$$_3$$)$$_2$$? (Reaction: Pb(NO$$_3$$)$$_2 + 2$$KCl → PbCl$$_2 + 2$$KNO$$_3)$$

Accepted Answer

$$0.350\ L$$

Question 19

Which of the following best describes a saturated solution?

Accepted Answer

A solution in which no more solute can dissolve at a given temperature

Question 20

Which of the following is a correct statement about solubility rules?

Accepted Answer

Compounds containing Na$$^+$$, K$$^+$$, or NH$$_4^+$$ are generally soluble

Solutions and Aqueous Reactions

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