Standardization
Primary standard for standardizing NaOH solution is:
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About This Question
- Subject
- chemistry
- Chapter
- principles related to practical chemistry
- Topic
- standardization
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
Oxalic acid
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 CO2 from the air.
- Oxalic acid (H2C2O4⋅2H2O) 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.
This easy difficulty chemistry question is from the chapter principles related to practical chemistry, covering the topic of standardization. It appeared in the 2025 exam.
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