• British Pharmacopoeia Volume V
  • Appendices
  • Appendix I A. General Reagents

Sodium Bismuthate
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Sodium Bismuthate NaBiO3 = 280.0 (12232-99-4)

Content, minimum 85.0%.

Yellow or yellowish-brown powder, slowly decomposing when moist or at a high temperature, practically insoluble in cold water.

Assay Suspend 0.200 g in 10 mL of a 200 g/L solution of potassium iodide and add 20 mL of dilute sulfuric acid. Using 1 mL of starch solution as indicator, titrate with 0.1 M sodium thiosulfate until an orange colour is obtained.

1 mL of 0.1 M sodium thiosulfate is equivalent to 14.00 mg of NaBiO3.