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Purity Calculation of Na2S2O5

blackcool
in Inorganic Chemistry

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Hi to all great member,

This is my first post on this forum after joining a few days ago. Nice meeting all of science people here...:).

 

I am really need clarification on how to calculate the purity of Sodium Meta Bisulfite above. I do the titration with Iodine 0.1 N until the color changes to faint black with starch indicator.

 

In water the Na2S2O5 + H2O ---> 2NaHSO3.

 

The purity calculated as:

{(VxNx47.5) / W mg)} x 100% = % w/w Na2S2O5 as Na2S2O5.

 

Is the above equation correct?. Any other thought?

 

Google was no help anyway :).

 

Thankyou in advance.

  • 2 weeks later...

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