Name: ______Period: ______

Molarity Practice

1. Determine the molarity of these solutions:

a)4.67 moles of Li2SO3 dissolved to make 2.04 liters of solution.

b)0.629 moles of Al2O3 to make 1.500 liters of solution.

c)4.783 grams of Na2CO3 to make 10.00 liters of solution.

2. Determine the number of moles of solute to prepare these solutions:

a)2.35 liters of a 2.00 M Cu(NO3)2 solution.

b)16.00 mL of a 0.415-molar Pb(NO3)2 solution.

c)3.00 L of a 0.500 M MgCO3 solution.

4. Determine the final volume of these solutions:

a)4.67 moles of Li2SO3 dissolved to make a 3.89 M solution.

b)4.907 moles of Al2O3 to make a 0.500 M solution.

c)0.783 grams of Na2CO3 to make a 0.348 M solution.

5. I make two sodium chloride solutions. In the first solution, I add 1.0 mole of salt to 1.0 L of water. In the second solution, I use 1.0 mole of salt to make a 1.0 L solution. Do the two solutions have the same molarity? Explain.

Molarity by Dilution Practice

- A stock solution of 1.00 M NaCl is available. How many milliliters are needed to make 100.0 mL of 0.750 M?

- What volume of 0.250 M KCl is needed to make 100.0 mL of 0.100 M solution?

- Concentrated H2SO4 is 18.0 M. If 0.112 L of the concentrated solution is diluted to 2.00 L, what is the molarity of the diluted solution?

- If I add 25 mL of water to 125 mL of a 0.15 M NaOH solution, what will the molarity of the diluted solution be?

- If I add water to 100 mL of a 0.15 M NaOH solution until the final volume is 150 mL, what will the molarity of the diluted solution be?

- How much 0.05 M HCl solution can be made by diluting 250 mL of 10 M HCl?

- I have 345 mL of a 1.5 M NaCl solution. If I boil the water until the volume of the solution is 250 mL, what will the molarity of the solution be?

- How much water would I need to add to 500 mL of a 2.4 M KCl solution to make a 1.0 M solution?