Molarity
and Solution Creation

1. 
The maximum concentration of salt in water at 0^{o}C
is 31.6 g/100 mL. What mass of salt can be dissolved in 250 mL of solution? 
2. 
To prepare for an experiment using flame tests, a
student requires 100 mL of 0.10 mol/L solutions of each of the following
substances. Calculate the required mass of each solid. 

a) NaCl 

b) KCl 

c) CaCl_{2} 
3. 
An experiment is planned to study the chemistry of
a home watersoftening process. The brine (sdoium chloride solution)
used in this process has a concentration of 25 g/100 mL. What is the
molar concentration of this solution? 
4. 
What volume of 0.055 mol/L glucose solution found
in a plant contains 2.0 grams of glucose, C_{6}H_{12}O_{6}(aq)? 
5. 
In a quantitative analysis for sulfate ions in a
water treatment plant, a technician needs 100 mL of 0.125 mol/L barium nitriate
solution. What mass of pure barium nitriate is required? 
6. 
A chemical analysis of silver uses 100 mL of a 0.155
mol/L solution of potassium thiocyanate, KSCN. Write a complete, specific
procedure for preparing the solution from the solid. Include all the
necessary calculations and precautions. 
7. 
Calculate the molar concentration of the following: 

a) 0.35 mole of copper(II) nitrate
is dissolved in water to make 50 mL of solution 

b) 10.0 grams of sodium hydroxide
is dissolved in water to make 2.00 L of solution. 

c) A sample of tap water contains
16 ppm of magnesium ions. 
8. 
Standard solutions of sodium oxalate, Na_{2}C_{2}O_{4(aq)},
are used in a variety of chmeical analyses. What mass of sodium oxalate
is required to prepare 250.0 mL of 0.375 mol/L solution? 
9. 
What is a standard solution, and why is such as solution
necessary? 
10. 
Standard solutions of potassium hydrogen tartrate,
KHC_{4}H_{4}O_{6(aq)}, are used in chemical analyses
to determine the concentration of bases such as sodium hydroxide. 

a) Calculate the mass of potassium hydrogen
tartrate that is needed to be measured to prepare 100.0 mL of a 0.150
M standard solution. 

b) Write a complete procedeure for the
preparation of this standard solution, including specific quantities and
equipment. 
11. 
Calculate the number of grams of each solute that
has to be taken to make each of the following solutions. 

a) 250 mL of 0.100 M NaCl 

b) 100 mL of 0.440 M C_{6}H_{12}O_{6}
(glucose) 

c) 500 mL of 0.500 M H_{2}O_{2} 
12. 
What is the molarity of pure water? 
13. 
Concentrated ammonia contains 26 grams NH_{3}
per 100 mL of solution. What is its molarity? 
14. 
What is the molarity of a solution prepared by dissolving
17.1 grams of ordinary sugar (C_{12}H_{22}O_{11})
in enough water to make 0.500 L of solution? 
15. 
What is the molarity of a solution made by dissolving
10.0 grams of NaOH in 0.200 L of water? 
16. 
Calculate the molarity of a solution containing 5.0
mg of BaCl_{2} per mL of solution. 
17. 
Calculate the grams of silver nitriate needed to
prepare 0.500 L of a 0.100 M solution. 
18. 
Calcualte the grams of BaCl_{2} needed to
prepare 200 mL of a 0.500 M solution. 
19. 
Calculate 

a) the volume of 2.0 M CaCl_{2}
that must be used to prepare 1200 mL of 0.80 M CaCl_{2} 

b) the volume of water that must be added 
20. 
Calculate the molarity of these solutions: 

a) 1.00 L containing 119 grams of KCl 

b) 2.00 L containing 223.5 grams of CuBr_{2} 

c) 0.250 L containing 13.35 grams of
aluminum chloride 

d) 0.150 L containing 13.0 grams of cobalt(II)
chloride 

e) 0.250 L containing 4.33 grams of chromium(III)
iodide 
21. 
What mass of solute is required to prepare the indicated
volume of each of these solutions? 

a) 500 mL of 3 M CaCl_{2} 

b) 750 mL of 2.0 M H_{2}SO_{4} 

c) 5.0 L of 0.50 M H_{2}C_{2}O_{4} 

d) 0.125 L of 8.00 M HC_{2}H_{3}O_{2} 

e) 5.0 X 10^{4} mL of 0.10 M
KBr 

f) 1.0 X 10^{3} L of 1.0
X 10^{3} M NH_{4}Cl 

g) 150 mL of 0.50 M ZnCl_{2} 
22. 
Fifty mL of 0.50 M HCl is mixed with 30 mL of 0.28
M HCl. Calculate the molarity of the resulting mixture. 