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Stannous sulfate turns brown in storage

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Q. I am trying to make stannous sulfate powder. I have already made it but when I store stannous sulfate powder, after 1-2 months it turns brownish-yellow.

I was reading on internet and somewhere it was mentioned that powder has to final washed with methanol. Please guide me how this is done and can I add methanol in basket centrifuge or outside and how much quantity should be used for 1 kg stannous sulfate powder.

Amit Kanodia
- Surat Gujarat
April 21, 2024

A. Stannous sulphate is easily oxidised by air causing the yellowish colour. Keep well sealed with minimum air exposure.

Geoffrey Whitelaw
retired 85+ metal finishing chemist - Port Melbourne, Australia

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