• British Pharmacopoeia Volume IV
  • Appendices
  • Appendix I B. Volumetric Reagents and Solutions
  • Volumetric Solutions

Ammonium Cerium(iv) Sulphate VS
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Ammonium Cerium(iv) Sulphate VS Ammonium and cerium sulphate; 2(NH4)2SO4,Ce(SO4)2,2H2O = 632.6

For a 0.1m solution Dissolve 65  g of ammonium cerium(iv) sulphate in a mixture of 30  ml of sulphuric acid and 500  ml of water. Allow to cool and dilute to 1000  ml with water.

Ascertain its exact concentration in the following manner. To 25  ml of the solution add 2  g of potassium iodide and 150  ml of water. Titrate immediately with 0.1m sodium thiosulphate VS using 1  ml of starch solution as indicator. Each  ml of 0.1m sodium thiosulphate VS is equivalent to 63.26  mg of (2NH4)2SO4,Ce(SO4)2,2H2O.

For a 0.01m solution To 100  ml of 0.1m ammonium cerium(iv) sulphate VS add, while cooling, 30  ml of sulphuric acid and sufficient water to produce 1000  ml.