Solutions Quiz
Questions: 16 · 10 minutes
1. A solution is made from 5.0 g of solute and 95.0 g of water. What is the solute's mass percent?
5.0%
5.3%
0.050%
19%
2. A 300 mL solution contains 12 g of glucose. What is its concentration in grams per liter?
3.6 g/L
25 g/L
36 g/L
40 g/L
3. For a very dilute aqueous solution with density approximately 1.00 kg/L, 25 ppm by mass is approximately equal to which concentration?
25 mg/L
2.5 mg/L
250 mg/L
0.025 mg/L
4. Assuming complete dissociation, what is the chloride-ion concentration in a 0.10 M CaCl2 solution?
0.20 M
0.10 M
0.050 M
0.30 M
5. How many moles of NaCl are needed to prepare 250 mL of a 0.20 M NaCl solution?
0.80 mol
0.20 mol
0.050 mol
0.0125 mol
6. What does the molarity of a solution describe?
Grams of solvent per mole of solute
Moles of solute per liter of solution
Moles of solute per kilogram of solvent
Grams of solute per liter of solvent
7. Which action lowers a solution's molarity without changing the number of moles of solute present?
Adding pure solvent
Evaporating some solvent
Adding more of the same solute
Removing a well-mixed portion of the solution
8. Some solvent evaporates from an uncovered solution, but no solute is lost. What happens to the solution's molarity?
It decreases because the total volume is smaller
It remains constant because the solute amount is unchanged
It increases because the same solute amount occupies less volume
It becomes zero once evaporation begins
9. A student dilutes 100 mL of a 2.0 M solution to a final volume of 500 mL. What is the new concentration?
0.20 M
10 M
2.5 M
0.40 M
10. A solution contains 0.50 mol of solute in a total volume of 2.0 L. What is its molarity?
0.10 M
4.0 M
1.0 M
0.25 M
11. A technician removes a 10 mL aliquot from a thoroughly mixed 0.30 M solution. No evaporation occurs. What is the aliquot's concentration?
It cannot be known without the original container volume
0.03 M
3.0 M
0.30 M
12. What volume of a 2.0 M stock solution is needed to prepare 100 mL of a 0.50 M solution?
10 mL
20 mL
25 mL
40 mL
13. Equal volumes of 0.20 M and 0.60 M solutions of the same solute are mixed. Assuming their volumes are additive, what is the final concentration?
0.20 M
0.40 M
0.60 M
0.80 M
14. Under identical conditions, a standard with concentration 0.20 M has an absorbance of 0.40. If absorbance is linear with concentration and the line passes through the origin, what concentration corresponds to an absorbance of 0.60?
0.13 M
0.20 M
0.30 M
0.24 M
15. Which piece of glassware is designed to prepare a solution to one precise final volume?
A graduated cylinder
A volumetric flask
A beaker
An Erlenmeyer flask
16. A stock solution has concentration M1. It will be diluted to concentration M2 and final volume V2. Which calculation gives the stock volume V1 needed?
Multiply M1 by V2, then divide by M2
Multiply M2 by V2, then divide by M1
Divide M2 by the product of M1 and V2
Multiply M1 by M2, then divide by V2