JAMB Chemistry 2020 Objective — Question 10
Question 10 of 40 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2020 Objective paper, with the correct answer and a full explanation.
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10. Sodium hydroxide is not considered a typical example of primary standard reagent for titration because
- A. A. it is not easily obtained with a high degree of purity
- B. B. its weight can be altered due to moisture absorption (it is hygroscopic)Correct
- C. C. it is too soluble in water
- D. D. it reacts too slowly with acids
Explanation
Sodium hydroxide is hygroscopic (absorbs moisture and CO2 from the air), so its weight changes on exposure to the atmosphere, making it unsuitable as a primary standard for titration.
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