1. Sodium sulfate is a compound used in many soap or detergent products. Calculate the number of moles of solute needed to make 85.0 mL of 2.22 mol/L sodium sulfate solution.
2. Calcium nitrate is sometimes used in regenerable cold packs. Calculate the mass of solute needed to make 75.0 mL of 2.35 mol/L calcium nitrate solution.