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Topic: Why sodium thiosulphate solution need to be standardized before use?  (Read 1149 times)

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Offline jasonpontus

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Why sodium thiosulphate solution need to be standardized before use?
« on: October 27, 2019, 04:03:10 AM »
I know sodium thiosulphate is not a primary substance. But what makes it not a primary substance? 
thx a lots!!
« Last Edit: October 27, 2019, 04:47:46 AM by jasonpontus »
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Offline AWK

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Re: Why potassium iodate(V) solution need to be standardized before use?
« Reply #1 on: October 27, 2019, 04:40:58 AM »
http://www.titrations.info/iodometric-titration

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« Last Edit: October 27, 2019, 05:21:09 AM by AWK »
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Offline Borek

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Re: Why sodium thiosulphate solution need to be standardized before use?
« Reply #2 on: October 27, 2019, 04:37:53 PM »
Quote from: jasonpontus on October 27, 2019, 04:03:10 AM
I know sodium thiosulphate is not a primary substance. But what makes it not a primary substance? 

What makes a substance a primary standard?
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