Q: A solution is prepared by dissolving $$30.0\ g of$$ $$NaOH in$$ $$120.0\ g of $$water. What is the mass percent ($$\%\ m/m) of$$ $$NaOH in $$the solution?

$$\displaystyle \frac{30.0}{150.0} \times 100 = 20\%$$

Question 1

Which of the following best describes the role of water in an aqueous solution of NaCl?

Accepted Answer

Water acts as the solvent, present in a larger amount.

Question 2

Which intermolecular force is primarily responsible for the dissolution of NaCl in water?

Accepted Answer

Ion-dipole interactions

Question 3

Which of the following compounds would be most soluble in hexane ($$C_6H_{14}$$), a nonpolar solvent?

Accepted Answer

Iodine ($$I_2)$$

Question 4

A solution is prepared by dissolving $$30.0\ g of$$ $$NaOH in$$ $$120.0\ g of $$water. What is the mass percent ($$\%\ m/m) of$$ $$NaOH in $$the solution?

Accepted Answer

$$\displaystyle \frac{30.0}{150.0} 	imes 100 = 20\%$$

Question 5

Which of the following reactions represents the dissociation of a strong electrolyte in water?

Accepted Answer

$$Na_2SO_4(s) \rightarrow 2Na^+(aq) + SO_4$^{2-}(aq)$$

Question 6

Which of the following best explains why oil does not dissolve in water?

Accepted Answer

Oil is nonpolar and water is polar, so there are essentially no intermolecular forces between them.

Question 7

A $$0.010\ M$$ sucrose solution is separated from a $$0.10\ M$$ sucrose solution by a semipermeable membrane. In which direction will water flow due to osmosis?

Accepted Answer

From the $$0.010\ M$$ solution to the $$0.10\ M$$ solution

Question 8

Which of the following best describes a saturated solution?

Accepted Answer

A solution that contains the maximum amount of solute that can dissolve at a specific temperature, with undissolved solute present.

Question 9

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

Accepted Answer

$$AgCl$$

Question 10

What is the molarity ($$M) of a $$solution prepared by dissolving $$2.50$$ moles of $$NaOH in $$enough water to make $$1.25\ L of $$solution?

Accepted Answer

$$2.00\ M$$

Question 11

Which of the following best describes a colloid?

Accepted Answer

A mixture with medium-sized particles that cannot be filtered but can be separated by a semipermeable membrane.

Question 12

Which of the following aqueous solutions will have the highest osmotic pressure?

Accepted Answer

$$0.05\ M$$ $$FeCl_3$

Question 13

A solution is prepared by dissolving $$35\ mL of $$isopropyl alcohol in enough water to make $$135\ mL of $$solution. What is the volume percent ($$\%\ v/v) of $$isopropyl alcohol?

Accepted Answer

$$26\%$$

Question 14

Which of the following best explains why methanol ($$CH_3OH) is $$soluble in water?

Accepted Answer

Methanol can form hydrogen bonds with water due to its $$-OH$$ group.

Question 15

Which of the following is a correct net ionic equation for the precipitation reaction between $$NaCl(aq)$$ and $$AgNO_3(aq$$)$$?

Accepted Answer

$$Ag^+(aq) + Cl^-(aq) \rightarrow AgCl(s)$$

Question 16

Which of the following best describes a non-electrolyte?

Accepted Answer

A compound that does not yield ions in water and does not conduct electricity.

Question 17

What is the final concentration if $$75.0\ mL of$$ $$3.50\ M$$ glucose solution is diluted to a volume of $$400.0\ mL$$?

Accepted Answer

$$0.656\ M$$

Question 18

Which of the following best describes the process of osmosis?

Accepted Answer

The movement of solvent molecules from low to high solute concentration through a semipermeable membrane.

Question 19

Which of the following is a strong electrolyte?

Accepted Answer

Potassium chloride ($$KCl)$$

Solutions: Properties, Types, and Solubility (Chapter 9 Study Notes)

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