PRACTICE EXERCISES

1. A 23.4% by mass solution of Ca3(PO4) aqueous solution with a solution density of 0.972

g/mL was prepared. Compute for the following:

a. Concentration of solution in Molarity

b. Concentration of solution in Molality

c. % mass of calcium ions

d. Mole % Solute

e. Volume % of Solvent if density of water is 1.0 g/mL

2. A 0.748 M solution of H2SO4 was prepared. If the density of the solution is 1.05 g/mL,

compute for the following:

a. Concentration in Molality

b. %mass of solute

c. Concentration of H+ ions

d. pH (assuming both H+ ions dissociate completely)

3. 36.9 grams of KBr was dissolved in 750 mL of water resulting in a total volume of 787

mL. Assuming that the density of water is 1.0 g/mL, compute for:

a. Concentration of solution in molality

b. Concentration of solution in molarity

c. %mass of solution