Sodium nitrite

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NSRV
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Sodium nitrite

Can anybody tell me a method about 0,1 M Sodium nitrite standardisation?

We use a method, but it is not properly work.

Our method:

Add 0,15 g sulfanilic acid and 2 ml 2M NaOH +2 ml H2O. Add 30 ml 20 % HCL solution. After this we titrate with 0,1 M sodium nitrite.

How long can we store 0,1 M sodium nitrite?