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Solutions Review: Concentration and Dilution

 

 1. 

Sugar in water is an example of which solute-solvent combination?
a.
gas-liquid
c.
solid-liquid
b.
liquid-liquid
d.
liquid-solid
 

 2. 

Which of the following expresses concentration?
a.
molality
c.
percent concentration by mass
b.
molarity
d.
all of the above
 

 3. 

Which of the following is expressed in grams of solute instead of moles of solute?
a.
molality
c.
neither a nor b
b.
molarity
d.
a and b
 

 4. 

What is the molarity of a solution that contains 0.202 mol KCl in 7.98 L solution?
a.
0.0132 M
c.
0.459 M
b.
0.0253 M
d.
1.363 M
 

 5. 

What is the molality of a solution that contains 5.10 mol KNO3 in 4.47 kg water?
a.
0.315 m
c.
1.02 m
b.
0.779 m
d.
1.14 m
 

 6. 

What is the molarity of a solution that contains 125 g NaCl in 4.00 L solution?
a.
0.535 M
c.
8.56 M
b.
2.14 M
d.
31.3 M
 

 7. 

What is the molality of a solution that contains 31.0 g HCl in 5.00 kg water?
a.
0.062 m
c.
0.170 m
b.
0.425 m
d.
15.5 m
 

 8. 

How many moles of HCl are present in 0.70 L of a 0.33 M HCl solution?
a.
0.23 mol
c.
0.38 mol
b.
0.28 mol
d.
0.47 mol
 

 9. 

The concentration of a water solution of NaCl is 2.48 m, and it contains 806 g of water. How much NaCl is in the solution?
a.
2.00 g
c.
117 g
b.
89.3 g
d.
224 g
 

 10. 

An NaOH solution contains 1.90 mol of NaOH, and its concentration is 0.555 M. What is its volume?
a.
0.623 L
c.
1.05 L
b.
0.911 L
d.
3.42 L
 

 11. 

What mass of water must be used to make a 1.35 m solution that contains 8.20 mol of NaOH?
a.
6.07 kg
c.
11.1 kg
b.
7.44 kg
d.
14.5 kg
 

 12. 

How many milliliters water are needed to make a 0.171 M solution that contains 1.00 g of NaCl?
a.
100 mL
c.
171 mL
b.
1000 mL
d.
17.1 mL
 

 13. 

(mols of solute/L of solution) is defined as
a.
molality
c.
percent (m/v)
b.
molarity
d.
percent (v/v)
 

 14. 

(mL of solute/mL of solution) x 100 is defined as
a.
molality
c.
percent (m/v)
b.
molarity
d.
percent (v/v)
 

 15. 

What is the percent (v/v) of 2.4 mL of acetone in 30.0 mL of water?
a.
0.080 %
c.
72 %
b.
8.0 %
d.
13 %
 

 16. 

How many mL of 18.0 M sulfuric acid would you need to make 750. mL of 0.500 M sulfuric acid solution?
a.
375 mL
c.
19 mL
b.
27.0 mL
d.
none of the above
 

 17. 

What equation do you use for dilutions?
a.
mols solute/L of solution
c.
C1V1 = C2V2
b.
C1/V1 = C2/V2
d.
g of solute/mL of solution
 

 18. 

How many grams of potassium sulfate do you need to make 1.20 L of a 25.0 % (m/v) solution?
a.
0.300 g
c.
300.0 g
b.
30.0 g
d.
20.8 g
 

 19. 

A solution contains 2.7 g of copper (II) sulfate in 75.0 mL. What  is the percent (m/v) of the solution?
a.
0.36 %
c.
3.6 %
b.
3600 %
d.
none of the above
 

 20. 

What is the molarity of a 20. % (m/v) solution of calcium chloride?
a.
0.56 M
c.
2.6 M
b.
1.8 M
d.
none of the above
 

 21. 

What is the percent (m/v) of 0.669 mols of magnesium hydroxide in 1.75 L of solution?
a.
1.58 %
c.
2.23 %
b.
38.2 %
d.
none of the above
 

 22. 

How many mL’s of 12.0 M HCl do you need to make 1.50 L of 3.20 % (m/v) HCl solution?
a.
0.110 mL
c.
110. mL
b.
0.400 mL
d.
400. mL
 

 23. 

500.0 mL of a 25.4 % (v/v) solution of ethanol and water has an unknown amount of ethanol, what is the volume of the ethanol in mL?
a.
19.7 mL
c.
254 mL
b.
12.7 mL
d.
127 mL
 

 24. 

How many grams of Grape Kool-Aid would you need to make 40.0 mL of a 0.750 % (m/v) solution? (molar mass of grape = 7.50 g/mol)
a.
0.0563 g
c.
2.25 g
b.
30.0 g
d.
0.300 g
 

Problem
 

 25. 

What is the molarity of a solution of sucrose, C12H22O11, that contains 125 g of sucrose in 3.50 L of solution?
 

 26. 

How many grams of NaC2H3O2 are needed to prepare 350. mL of a 2.75 M solution?
 

 27. 

What is the molarity of 235 g of potassium carbonate dissolved in 1750 mL of solution?
 

 28. 

What is the percent (m/v) of 3.00 mols of calcium perchlorate in 1.35 L of solution?
 

 29. 

How many mL’s of 13.8 M HNO3 do you need to make 350.0 mL of 1.75 M HNO3 solution?
 

 30. 

If you use 15.0 mL of 12.0 M HCl and dilute it to 750 mL, what is the final concentration
in % (m/v)?
 



 
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