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4"2Molarity Practice Worksheet
Find the molarity of the following solutions:
1) 0.5 moles of sodium chloride is dissolved to make 0.05 liters of solution.
2) 0.5 grams of sodium chloride is dissolved to make 0.05 liters of solution.
3) 0.5 grams of sodium chloride is dissolved to make 0.05 mL of solution.
4) 734 grams of lithium sulfate are dissolved to make 2500 mL of solution.
5) 6.7 x 10-2 grams of Pb(C2H3O2)4 are dissolved to make 3.5 mL of solution.
6) I have two solutions. In the first solution, 1.0 moles of sodium chloride is dissolved to make 1.0 liters of solution. In the second one, 1.0 moles of sodium chloride is added to 1.0 liters of water. Is the molarity of each solution the same? Explain your answer.
7) How many grams of beryllium chloride are needed to make 125 mL of a 0.050 M solution?
8) Explain how to make at least one liter of a 1.25 molar ammonium hydroxide solution.
9) What is the molarity of a solution in which 0.45 grams of sodium nitrate are dissolved in 265 mL of solution.
10) What will the volume of a 0.50 M solution be if it contains 25 grams of calcium hydroxide?
11) How many grams of ammonia are present in 5.0 L of a 0.050 M solution?
Solutions to the Molarity Practice Worksheet
For the first five problems, you need to use the equation that says that the molarity of a solution is equal to the number of moles of solute divided by the number of liters of solution.
1) 10 M.
2) 0.17 M.
3) 170.9 M
4) 2.67 M.
5) 4.32 x 10-2 M
6) The equation for molarity states that the molarity of a solution is equal to the number of moles of solute divided by the number of liters of solution. In the first equation, the molarity will clearly be equal to 1.0 M, because there are 1.0 moles of NaCl and a solution volume of 1.0 L. In the second solution, the molarity will be different, because the solution volume will be greater than 1.0 liters. Why? If you already have 1.0 L of water and add 1.0 moles of salt to it, it will overflow. This is because the volume will be roughly equal to the volume of the water plus the volume of the salt, which will be greater than 1.0 L. It is for this reason that when you make a solution, you always dissolve the solute in only a little bit of water and then add water to make your final volume.
7) 0.50 grams
8) Dissolve 43.8 grams (1.25 moles) of ammonium hydroxide in 1 L H2O.
9) 0.020 M
10) 680 mL
11) 4.3 grams
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