Why Is FeSO4 Not a Primary Standard?

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feso4 is not a primary standard??

hi ppl,
someone plssss help me---why is feso4 not a primary standard?
 
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Hi

It cannot be a primary standard. Because it is not stable. A primary standard must be cheap, inert (stable), etc... You may want to do a google search about "primary standards".
 
what about fas?

hi ,
thanks for ur reply but ferrous ammonium sulphate is not a primary standard acc to u??
 
You need to know the characteristics of a primary standard to answer the question, as some of the ones that chem tr has mentioned.