Division 3.24 Citrate buffer, c = 0,2 mol Na+/l, pH 2,2:

Dissolve 19,61 g sodium citrate (3.8), 5 ml thiodiglycol (3.9), 1 g phenol (3.3) and 16,5 ml HCl (3.7) in approximately 800 ml water. Adjust pH to 2,2. Make up to 1 litre with water.