Neco 2022 Chemistry Question 16
Practice objective / multiple choice question 16 from the 2022 Neco Chemistry examination.
A buffer solution is prepared by mixing a weak acid HA (\( \mathrm{p}K_a = 4.75 \)) with its sodium salt NaA. To obtain a buffer of \( \mathrm{pH}=5.75 \), \(0.500\ \text{L}\) of solution is required with a total concentration of HA plus A⁻ equal to \(0.200\ \text{M}\). Determine the mass of NaA (molar mass \(82\ \text{g mol}^{-1}\)) that must be added.
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About This Question
This is Neco 2022 Chemistry Question 16. It is one of the objective questions from the 2022 Neco Chemistry examination.
Difficulty level: Medium .
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