1. Which aqueous solution has the highest boiling point? a. 0.20 M NaCl b. 0.10

Question

1. Which aqueous solution has the highest boiling point?

a. 0.20 M NaCl

b. 0.10 M CaCl2

c. 0.1 M Ga2(SO4)3

d. 0.2 M C6H12O6

2. True or false: One mole of MgCl2, in solution, will have the same effect on the colligative properties, as one mole of Fe2(SO4)3

3. True or false: 15 ppm of a substance in water is equal to a concentration of 1.5 mg/mL

4. 2.0 X 103 mL (2,000mL) of solution was prepared by dilution of 28.0 mL of 18.0 M H2SO4. What is the concentration of the diluted solution?

a. 1.29M

b. 0.252M

c. 0.504M

d. 0.778M

5. A concentration of one ppth of solute in an aqueous solution is equal to ____?

a. 1mg per mL

b. 1 µg per mL

c. 1 g per mL

d. 1 kg per mL

e. 1 dg mer mL

6. Which of the following compounds will be soluble in CCl4?

a. H2O

b. C8H12

c. NaOH

d. none of these

e. NaCl

7. The solutions of which of the following solutes will conduct electricity well when dissolved?

a. HCHO

b. NaBr

c. CH3CH2OH

d. HCOOC2H5

e. C(CH3)4

8. The solubility of gases in water usually decreases with:

a. increased pressure

b. increased temperature

c. decreased temperature

d. no answer text provided

9. Which of the following is a solution?

a. pure gold

b. sand in water

c. soil

d. steel

e. oil in water

Explanation / Answer

boiling point elevation is directly proportional to molarity*vanthoff factor

vant hoff factor depends on diassociation of ions

for NaCl i = 2 BPE = 0.2 * 2 = 0.4

for CaCl2 i =3 BPE = 0.1 * 3 = 0.3

for Ga2(SO4)3 i = 5 BPE = 0.1 * 5 = 0.5

for C6H12O6 i =1 BPE = 0.2 * 1 = 0.2

so Ga2(SO4)3 will have highest boiling point

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