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

Sodium Nitrite
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Sodium Nitrite NaNO2 = 69.0 (7632-00-0)

Content, minimum 97.0%.

White or almost white, granular powder or a slightly yellow, crystalline powder, freely soluble in water.

Assay Dissolve 0.100 g in 50mL of water. Add 50.0 mL of 0.02 M potassium permanganate and 15 mL of dilute sulphuric acid. Add 3 g of potassium iodide. Titrate with 0.1 M sodium thiosulfate, using 1.0 mL of starch solution added towards the end of the titration as indicator.

1 mL of 0.02 M potassium permanganate is equivalent to 3.450 mg of NaNO2.