1) How much of each source material is required to make the stated solution: (9 marks)

a) 250 mL of a 80 ppm Cs from Cs₂CrO₄ (F.W. 381.80 g/mol)

b) 250 mL of a 250 ppm Carbon (C) from potassium citrate (K₃C₆H₅O₇ F.W. 306.395 g/mol)

c) 200mL of 0.25M EDTA from Na₂EDTA dihydrate (Na₂EDTA2H₂O F.W. 372.24 g/mol)