Free Quiz-Solutions and Concentrations

1) A solution of H2SO4 at 27% by weight has a density of 1.19 g/ml. Knowing that the molecular weight of sulfuric acid is 98.079 g/mol, calculate the molarity of the solution.

2) A solution of KOH is 0.5 M (molar). Calculate the volume of water that must be added to 700 mL of the previous solution, to obtain 0.35 M.

3) Pure water is added to 150 mL of a 0.60 M (molar) Na2SO4 solution until a total volume of 222 mL is reached. Calculate the normality (N) of the resulting solution.

4) The molality of a solution is 0.511 mol/kg. Knowing that the density of the solution is 1.15 g/mL and that the molecular weight of the dissolved solute is 342 g/mol, calculate the molarity of the solution.

5) Given a 57 wt% aqueous solution of HI (Mm 127.9 g/mol), calculate the mole fraction of the solute. (The molecular weight of water is 18.02 g/mol)

6) 15 mL of H2SO4 (Mm = 98.1 g/mol) 19.2% weight solution (the density of solution is 1.132 g/mL) were added to a 35 mL of H2SO4 0.195 M (molar) solution; then water was added to reach a final volume of 80 mL. Which is the molarity of the resulting solution?