Neco 2025 Chemistry Question 27
Practice objective / multiple choice question 27 from the 2025 Neco Chemistry examination.
An unknown monoprotic acid HA is titrated with 0.100\,M NaOH. A 40.0\,mL sample of the acid solution requires 25.0\,mL of NaOH to reach the equivalence point. A second experiment takes a 10.0\,mL aliquot of the same acid solution, adds 5.00\,mL of 0.050\,M NaOH, and then titrates the mixture to the endpoint with the same 0.100\,M NaOH. The volume of NaOH required in this second titration is 7.50\,mL. Given that the acid dissociation constant \(K_a = 1.0 \times 10^{-5}\), calculate (i) the original concentration of HA (in\,M) and (ii) the pH of the solution after the partial neutralisation (just before the second titration).
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About This Question
This is Neco 2025 Chemistry Question 27. It is one of the objective questions from the 2025 Neco Chemistry examination.
Difficulty level: Hard .
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