pre requisite for a primary standard solution
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High purity.
Stability (low reactivity)
Low hygroscopicity (to minimize weight changes due to humidity)
High equivalent weight (to minimize weighing errors)
Non-toxicity.
Ready and cheap availability.
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the requisites for a substance to be a primary standard are as follows:
1) They shouldn’t be more hygroscopic and affected by moisture of the atmosphere.
2) They shouldn’t have high atomic weight and equivalent weight.
3) They are easily available in pure and dry state.
4) They are easily soluble in water without the change in their composition.
5) They should be non-toxic, non-volatile and non-deliquescence.
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