Molarity (M) = Moles of Solute Per Liter of Solution

WS 2 Ch 14.4 -- Molarity

Molarity (M) = moles of solute per liter of solution

1. Calculate the molarity (M) of a solution prepared by dissolving 0.500 moles of NaCl in enough water to make 0.300 liters of solution.

M = moles/liter

= 0.500 mol/0.300 L

= 1.67 mol/L or, simply, 1.67 M

In other words, the concentration of the solution is 1.67 moles of solute (NaCl) per liter of solution.

2. Calculate the molarity (M) of a solution prepared by dissolving 0.289 moles of FeCl3 in enough water to make 120. mL of solution. Hint: convert mL to L, then solve for M using the equation M = mol/liters.

3. 75.0 mL of a solution contain 0.0877 moles of CuCO3. What is the molarity of the solution?

M = moles solute/liters of solution

4. How many grams of NaCl are required to make 600. mL of a 1.55 M NaCl solution?

If M = mol/liters, then solve for moles of NaCl and convert to grams.

Moles = liters x M

5. How many moles of H2SO4 are present in 1.63 liters of a 0.954 M solution?

6. How many liters of solution are needed to make a 1.66 M solution containing 2.10 moles of NaOH?

Solve for L: Liters = moles/M

7. What volume of a 0.250 M solution can be made using 0.550 moles of HNO3?

8. What is the molarity of 650. mL of a solution containing 63.0 grams of NaCl?

9. How many grams of Ca(OH)2 are needed to produce 500. mL of a 1.66 M Ca(OH)2 solution?

10. What volume of a 0.880 M solution can be made using 130. grams of FeCl2?

11. How many moles of HCl are required to produce a 2.50 M solution with a volume of 1.50 L?

12. How many grams of CaCl2 are required to produce a 3.50 M solution with a volume of 2.00 L?