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Standardising a solution

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Chenga
Junior Member


Joined: 07 Apr 2005
Posts: 4
Location: United Kingdom

PostPosted: Fri Apr 08, 2005 10:47 am    Post subject: Standardising a solution Reply with quote

Does anyone know why solutions of sodium thiosulphate have to be standardised? why can the concentration on the bottle be trusted?
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john500
Member


Joined: 10 Mar 2005
Posts: 11

PostPosted: Fri Apr 08, 2005 8:00 pm    Post subject: Reply with quote

It decomposes. Variables that affect the rate include pH, bacteria, concentration and UV light. See
Analytical Chemistry an introduction, Skoog, D.A., West, Holler, 1990, Saunders, Phil, p 309
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