Concentration Worksheet
W 328
Everett Community College
Student Support Services Program
1) 6.80 g of sodium chloride are added to 2750 mL of water. Find the mole fraction
of the sodium chloride and of the water in the solution.
2) How many grams of magnesium cyanide are needed to make 275 mL of a 0.075
M solution?
3) How many grams of magnesium cyanide would you need to add to 275 mL of
water to make a 0.075 molal solution?
4) Explain how to make one liter of a 1.25 molal sodium hydroxide solution.
5) What is the molarity of a solution made when 52 grams of potassium sulfate are
diluted to a volume of 4100 mL?
6) The density of ethylene glycol (antifreeze, HOCH2CH2OH) is 1.09 g/mL. How
many grams of ethylene glycol should be mixed with 375 mL of water to make a
7.50% (v/v) mixture?
7) Find the volume of a 0.75 M solution if it contains 39 grams of potassium
hydroxide.
8) How many grams of hydrochloric acid are present in 3.0 L of a 0.750 M solution?
9) The concentration of oxygen in water at the bottom of a lake is 0.48 g/L and the
pressure is 2.5 atm. If water from the bottom is moved by a current upwards to
a depth where the pressure is 1.3 atm, what is the concentration of the oxygen
in the water at this depth?
10) What is the molarity of a solution in which 0.850 grams of ammonium nitrate are
dissolved in 345 mL of solution?
11) Explain how you would make 675 mL of a 0.400 M barium iodide solution.
