Gce Model Questions Vol1 2021 Chemistry Question 7

Practice objective / multiple choice question 7 from the 2021 Gce Model Questions Vol1 Chemistry examination.

Gce Model Questions Vol1 2021 Chemistry Objective / Multiple Choice Medium Difficulty
Question 7 GCE_MODEL_QUESTIONS_VOL1 • 2021 • CHEMISTRY • objective

A 250 mL solution of a weak monoprotic acid HA has an initial pH of 3.00. After adding 0.010 mol of NaOH, the pH becomes 8.00. Determine (a) the acid dissociation constant \(K_a\) of HA and (b) the base dissociation constant \(K_b\) of its conjugate base \(A^-\).

Answer Options

A. Ka = 3.3×10⁻⁵, Kb = 3.0×10⁻¹⁰
Correct Answer B. Ka = 2.5×10⁻⁵, Kb = 4.0×10⁻¹⁰
C. Ka = 5.0×10⁻⁶, Kb = 2.0×10⁻⁹
D. Ka = 1.2×10⁻⁴, Kb = 8.3×10⁻¹¹
Correct Answer
B
Correct Option:
Ka = 2.5×10⁻⁵, Kb = 4.0×10⁻¹⁰

About This Question

This is Gce Model Questions Vol1 2021 Chemistry Question 7. It is one of the objective questions from the 2021 Gce Model Questions Vol1 Chemistry examination.

Difficulty level: Medium .

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