Question 1

Which of the following best describes the solvent in a glass of lemonade, as shown in the image?

Accepted Answer

Water

Question 2

A solution is prepared by dissolving 10.0 g of NaCl in enough water to make 250.0 mL of solution. What is the molarity of the solution? (Molar mass of NaCl = 58.44 g/mol)

Accepted Answer

$$0.684\ \mathrm{M}$$

Question 3

Which of the following is a strong electrolyte when dissolved in water?

Accepted Answer

NaCl

Question 4

A chemist needs to prepare 500.0 mL of 0.200 M H$$_2SO$_4$$ from a 2.00 M stock solution. What volume of the stock solution should be used?

Accepted Answer

$$50.0\ \mathrm{mL}$$

Question 5

Which of the following compounds is insoluble in water?

Accepted Answer

PbSO$$_4$$

Question 6

A 25.0 mL sample of 0.100 M AgNO$$_3 is $$mixed with excess Na$$_2CO$_3. $$How many grams of Ag$$_2CO$_3$$ are produced? (Molar mass Ag$$_2CO$_3 = 275.74 g/$$mol)

Accepted Answer

$$0.345\ \mathrm{g}$$

Question 7

Which of the following best describes a weak electrolyte?

Accepted Answer

A substance that partially dissociates into ions in solution

Question 8

How many grams of H$$_3PO$_4$$ are present in 265 mL of a 1.50 M solution? (Molar mass H$$_3PO$_4 = 97.99 g/$$mol)

Accepted Answer

$$39.0\ \mathrm{g}$$

Question 9

Which of the following is the correct dilution equation?

Accepted Answer

$$M_1V_1 = M_2V_2$$

Question 10

A 55.0 mL sample of 0.102 M K$$_2SO$_4 is $$mixed with 35.0 mL of 0.114 M Pb(C$$_2H$_3O$_2$$)$$_2. If 1.01 g of $$PbSO$$_4 is $$collected, what is the percent yield? (Molar mass PbSO$$_4 = 303.26 g/$$mol, limiting reactant is Pb(C$$_2H$_3O$_2$$)$$_2)$$

Accepted Answer

$$83.5\%$$

Question 11

Which of the following is NOT a soluble compound according to the solubility rules?

Accepted Answer

BaSO$$_4$$

Question 12

What is the molarity of a solution prepared by dissolving 2.488 g of Al(NO$$_3$$)$$_3 in $$enough water to make 250.0 mL of solution? (Molar mass Al(NO$$_3$$)$$_3 = 212.996 g/$$mol)

Accepted Answer

$$0.0466\ \mathrm{M}$$

Question 13

Which of the following best explains why sugar solution does not conduct electricity?

Accepted Answer

Sugar molecules do not dissociate into ions in water

Question 14

A 1.00 g sample of NaOH is dissolved in water. What volume of 67.8 mM NaOH solution will contain this amount of NaOH? (Molar mass NaOH = 40.00 g/mol)

Accepted Answer

$$368.7\ \mathrm{mL}$$

Question 15

Which of the following is the correct net ionic equation for the reaction between K$$_2SO$_4$$ and Pb(C$$_2H$_3O$_2$$)$$_2$$?

Accepted Answer

$$\mathrm{Pb}^{2+} (aq) + \mathrm{SO}_4$$^{2-}$$ (aq) \rightarrow \mathrm{PbSO}_4 (s)$$

Question 16

A 25.00 mL sample of an unknown H$$_3PO$_4$$ solution is titrated with 0.150 M NaOH. The equivalence point is reached when 22.97 mL of NaOH is added. What is the concentration of the H$$_3PO$_4$$ solution?

Accepted Answer

$$0.0459\ \mathrm{M}$$

Question 17

Which of the following is a correct statement about the process of dilution?

Accepted Answer

Always add acid to water, not water to acid

Question 18

Which of the following best describes a solution with a concentration of 1.5% (m/v) NaCl?

Accepted Answer

1.5 grams NaCl in 100 mL solution

Question 19

A 500.0 mL solution contains 0.100 M HCl and 0.200 M H$$_2SO$_4. $$What volume of 0.150 M KOH is required to neutralize all the acid?

Accepted Answer

$$1.66\ \mathrm{L}$$

lecture 7 =)(ns) Solutions, Molarity, and Stoichiometry: Study Notes for General Chemistry

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