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. 

write an dissociation equation and calculate the concentrations of all ions present when 100.0 g of Na2OOCCOO is dissolved to make 5.0 L of solution.