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why a standard sollution of NaOH cannot ...

why a standard sollution of NaOH cannot be-prepared direct weighing cold NaOH ?

Text Solution

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NaOH is deliquescent and reacts with atomospheric `CO_(2)` to form `Na_(2)CO_(3)`, thus NaOH is not pure but contains impurity of `Na_(2)CO_(3)`.
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