Igcse Model Questions Vol1 2020 Chemistry Question 1
Practice objective / multiple choice question 1 from the 2020 Igcse Model Questions Vol1 Chemistry examination.
A 0.250 g sample of a monoprotic weak acid HA (molar mass unknown) is dissolved in 250.0 mL of water. The solution is titrated with 0.100 M NaOH. It is found that 30.0 mL of the NaOH solution are required to reach the equivalence point, and the pH of the solution at equivalence is 8.72. Calculate the acid dissociation constant \(K_{a}\) of HA. (Give your answer in scientific notation to two significant figures.)
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This is Igcse Model Questions Vol1 2020 Chemistry Question 1. It is one of the objective questions from the 2020 Igcse Model Questions Vol1 Chemistry examination.
Difficulty level: Medium .
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