Reagents:
C 0.1N HCl (standard)
C Concentrated sulphuric acid
C Sodium hydroxide solution 40% w/w
C Digestion mixture: Potassium sulphate (K SO ) and 2 4
copper sulphate (CuSO ). 4
C Boric acid: Dissolved 40 g of boric acid in sufficient
distilled water and made the volume up to 100 ml.
C Indicator: Methyl red