standardization

Question

Primary standard for standardizing NaOH solution is:

RankGuru · Accepted Answer

A **Primary Standard** is a substance that is very pure, stable, and can be weighed accurately to make a solution of exactly known concentration.
- **$NaOH$** is not a primary standard because it is hygroscopic (absorbs moisture) and reacts with $CO_2$ from the air.
- **Oxalic acid ($H_2C_2O_4 \cdot 2H_2O$)** is used as a primary standard. It is a solid, does not change mass in air, and has high equivalence weight, making it ideal for standardizing $NaOH$ solutions via simple acid-base titration.

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standardization

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