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why NaOH connot be used as a primary standard?
A primary standard should essentially available in pure form , stable towards light and heat and react in a stoichiometric proportion. Sodium hydroxide cannot be used as a primary standard because of it's hygroscopic properties as a solid. Because it is so prone to absorbing moisture, it is impossible to accurately measure the mass of a solid sample in open air. Also NaOH absorbs carbon dioxide from the atmosphere.
A primary standard should essentially available in pure form , stable towards light and heat and react in a stoichiometric proportion.
Sodium hydroxide cannot be used as a primary standard because of it's hygroscopic properties as a solid. Because it is so prone to absorbing moisture, it is impossible to accurately measure the mass of a solid sample in open air.
Also NaOH absorbs carbon dioxide from the atmosphere.
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