Q: 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?

$$M = \frac{\text{moles}}{\text{volume (L)}} = \frac{25.5/119.0}{1.75} = 0.122 M$$

Q: A 10.0 mL sample of 0.20 M HBr is titrated with 0.10 M NaOH. What volume of NaOH is required to reach the equivalence point?

$$M_1V_1 = M_2V_2 \rightarrow 0.20 \times 10.0 = 0.10 \times V_2$ \rightarrow V_2$ = 20.0 mL$$

Question 1

A laboratory technician needs to prepare 500 mL of a 0.250 M NaCl solution from a 2.00 M NaCl stock solution. What volume of the stock solution should be used?

Accepted Answer

$$M_1V_1 = M_2V_2$$; $$V_1$$ = \frac{M_2V_2}{$$M_1$$} = \frac{0.250 	imes 0.500}{2.00} = 0.0625$$ L or 62.5 mL

Question 2

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

Accepted Answer

BaSO$$_4$$

Question 3

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

$$M = \frac{	ext{moles}}{	ext{volume (L)}} = \frac{25.5/119.0}{1.75} = 0.122 M$$

Question 4

Which of the following best describes a strong electrolyte?

Accepted Answer

A substance that completely dissociates into ions in water and conducts electricity well

Question 5

A 10.0 mL sample of 0.20 M HBr is titrated with 0.10 M NaOH. What volume of NaOH is required to reach the equivalence point?

Accepted Answer

$$M_1V_1 = M_2V_2 ightarrow 0.20 	imes 10.0 = 0.10 	imes V_2$ ightarrow V_2$ = 20.0 mL$$

Question 6

Which of the following is the net ionic equation for the reaction between aqueous HI and aqueous Ba(OH)$$_2$$?

Accepted Answer

$$2H^+(aq) + 2OH^-(aq) \rightarrow 2H_2O(l)$$

Question 7

Which of the following best explains why hard water reduces the effectiveness of soap?

Accepted Answer

Ca$$^{2+}$$ and Mg$$^{2+}$$ ions react with soap to form insoluble precipitates, reducing cleaning action

Question 8

Assign the oxidation state to each atom in CO$$_2.$$

Accepted Answer

C: +4, O: -2

Question 9

Which of the following reactions is a precipitation reaction?

Accepted Answer

$$Pb(NO_3$)_2(aq) + 2KI(aq) \rightarrow $$PbI_2$$(s) + 2KNO_3(aq)$$

Question 10

Which of the following is the correct net ionic equation for the reaction between SrCl$$_2(aq) $$and Li$$_3PO$_4(aq$$)?

Accepted Answer

$$3Sr^{2+}(aq) + 2PO$$_$$4^{3-}(aq$$) \rightarrow $$Sr_3$$($$PO_4)_2(s$$)$$

Question 11

A solution is prepared by dissolving 0.255 mol of NaOH in enough water to make 2.04 L of solution. What is the molarity of the solution?

Accepted Answer

$$M = \frac{0.255}{2.04} = 0.125 M$$

Question 12

Which of the following best describes the role of an oxidizing agent in a redox reaction?

Accepted Answer

It causes another substance to lose electrons and is itself reduced

Question 13

Which of the following compounds is a strong electrolyte?

Accepted Answer

NaCl(aq)

Question 14

Which of the following best explains why molecular compounds like sugar do not conduct electricity in water?

Accepted Answer

They dissolve as intact molecules and do not produce ions

Question 15

Which of the following is the correct molecular equation for the reaction between aqueous nitric acid and aqueous sodium carbonate?

Accepted Answer

$$Na_2CO_3(aq) + 2HNO_3(aq) \rightarrow 2NaNO_3(aq) + CO_2$(g) + H_2O(l)$$

Question 16

Which of the following best describes the process of dissolution for an ionic compound in water?

Accepted Answer

The attraction between ions and water molecules overcomes the attraction between the ions themselves, causing the compound to dissociate into ions

Question 17

Which of the following statements about the activity series of metals is correct?

Accepted Answer

Metals at the top of the series are more easily oxidized than those at the bottom

Introduction to Solutions and Aqueous Reactions: Study Notes

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Study Guide - Flashcards