Question 1

Which of the following best describes a concentrated solution?

Accepted Answer

A solution with a relatively large amount of solute compared to solvent.

Question 2

What is the molarity (M) of a solution prepared by dissolving 25.5 g of KBr (molar mass = 119.00 g/mol) in enough water to make 1.75 L of solution?

Accepted Answer

$$0.122\ \mathrm{M}$$

Question 3

A chef uses a precipitation reaction to encapsulate a liquid in molecular gastronomy. What is the solid that forms in this reaction called?

Accepted Answer

Precipitate

Question 4

How many moles of solute are required to make 3.0 L of a 2.0 M solution?

Accepted Answer

$$6.0\ \mathrm{mol}$$

Question 5

If you dissolve 25 g of salt in 251 g of water, what is the mass of the resulting solution?

Accepted Answer

$$276\ \mathrm{g}$$

Question 6

Which equation correctly relates the initial and final concentrations and volumes for a dilution?

Accepted Answer

$$M_1V_1 = M_2V_2$$

Question 7

To what volume should you dilute $$0.200\ \mathrm{L} of a$$ $$15.0\ \mathrm{M}$$ NaOH solution to obtain a $$3.00\ \mathrm{M}$$ NaOH solution?

Accepted Answer

$$1.00\ \mathrm{L}$$

Question 8

Which of the following best describes the process of preparing a 1.00 M NaCl solution?

Accepted Answer

Add 1.00 mol NaCl to less than 1 L of water, dissolve, then add water until the total volume is 1 L.

Question 9

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

Accepted Answer

$$2.04\ \mathrm{L}$$

Question 10

Which of the following images best represents the same volume of an aqueous ethanol solution after adding an equal volume of water?

Accepted Answer

The number of ethanol molecules per unit volume decreases.

Question 11

A solution is prepared by mixing 0.150 L of 0.175 M Pb(NO$$_3$$)$$_2$$ with 0.150 M KCl. According to the reaction $$\mathrm{Pb(NO_3$)_2(aq) + 2KCl(aq) \rightarrow $$PbCl_2$$(s) + 2KNO_3(aq)}$$, what volume of KCl solution is required to completely react with the Pb(NO$$_3$$)$$_2$$?

Accepted Answer

$$0.350\ \mathrm{L}$$

Question 12

Which of the following statements about molarity is correct?

Accepted Answer

Molarity is the number of moles of solute per liter of solution.

Question 13

If you mix equal volumes of a 1 M solution of A and a 1 M solution of B in a reaction where A and B react in a 1:1 ratio, what is the limiting reactant?

Accepted Answer

Neither, both are limiting.

Question 14

Which of the following is a correct conceptual plan for converting the volume of a reactant solution to the volume of a product solution in a stoichiometric reaction?

Accepted Answer

Volume A $$\rightarrow$$ Amount A (mol) $$\rightarrow$$ Amount B (mol) $$\rightarrow$$ Volume B

Question 15

A laboratory technician needs to prepare 250.0 mL of a 1.50 M KBr solution. What mass of KBr (in grams) is required? (Molar mass of KBr = 119.00 g/mol)

Accepted Answer

$$44.6\ \mathrm{g}$$

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

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