Molarity Practice Problems

1. What is the molarity of a solution that has 25.0 grams of sodium chloride dissolved in enough water to make

500.0 mL of solution?

2. What is the molarity if 35.0 g of zinc nitrate is dissolved in enough water to make 750. mL of solution?

3. How many grams of sodium chloride are needed to prepare 2.50 liters of a 1.34 M solution?

4. What mass of copper (I) sulfate is present in 1270 mL of a 2.50 M solution?

5. What volume of water (in L) must be added to 65.8 g of potassium silicate to form a 1.25 M solution (assume the volume of the potassium silicate is insignificant)?

6. Calculate the molarity of a solution which contains 0.40 mol of a substance dissolved in 1.6 L of a solution.

7. What is the molarity of a solution containing 325 g of sodium chloride dissolved in 750. mL of solution?

8. You are making 2.2 L of 3.1 M silver nitrate solution. Who many moles of solute are there?

9. How many grams of magnesium chloride are needed to make 700.mL of a 1.4 M solution?

10) 93.2 g of copper (II) sulfate is mixed into 290. mL of water. What is the molarity?

Dilutions

1. To what volume should 11.9 mL of an 8.00 M acetic acid solution be diluted to obtain a final solution that is 1.50 M?

2. What volume of a 5.75 M formic acid solution should be used to prepare 2.0 L of a 1.0 M formic acid solution? (Formic acid = HCOOH)

3. What is the molarity of a solution of ammonium chloride prepared by diluting 50.0 mL of 3.79 M ammonium chloride solution to 2.0 L?

4. A 25.0 mL sample of ammonium nitrate solution produces a 0.186 M solution when diluted with 50.0 mL of water. What is the molarity of the stock solution?

5. What volume of 8.0 M stock solution must be used to make 750 mL of a 0.20 M solution?

6. What volume of water must be added to 30.0 mL of 9.2 M stock solution to make a 1.2 M solution?

7. Determine the molarity of a stock solution if 81.0 mL of it were used to make 650 mL of 0.60 M solution.

8) 250 mL of water are added to 35 mL of 4.2 M stock. What is the new concentration?

9. To what volume does 15 mL of a 4.9 M solution need to be diluted in order to obtain a final solution that is 0.80 M?