Igcse Model Questions Vol1 2017 Chemistry Question 38

Practice objective / multiple choice question 38 from the 2017 Igcse Model Questions Vol1 Chemistry examination.

Igcse Model Questions Vol1 2017 Chemistry Objective / Multiple Choice Medium Difficulty
Question 38 IGCSE_MODEL_QUESTIONS_VOL1 • 2017 • CHEMISTRY • objective

A 250 cm³ solution contains 0.10 mol of acetic acid (CH₃COOH) and 0.15 mol of sodium acetate (CH₃COONa). The solution is at 25 °C, \(K_{a}=1.8\times10^{-5}\). (a) Calculate the initial pH of the solution. (b) After adding 0.020 mol of HCl, calculate the new pH. (c) Determine the amount of NaOH (in mol) required to restore the pH to its original value.

Answer Options

A. Initial pH = 4.85; after HCl addition pH = 4.70; 0.018 mol NaOH needed to restore the original pH
Correct Answer B. Initial pH = 4.92; after HCl addition pH = 4.78; 0.020 mol NaOH needed to restore the original pH
C. Initial pH = 4.60; after HCl addition pH = 4.45; 0.025 mol NaOH needed to restore the original pH
D. Initial pH = 5.05; after HCl addition pH = 4.90; 0.022 mol NaOH needed to restore the original pH
Correct Answer
B
Correct Option:
Initial pH = 4.92; after HCl addition pH = 4.78; 0.020 mol NaOH needed to restore the original pH

About This Question

This is Igcse Model Questions Vol1 2017 Chemistry Question 38. It is one of the objective questions from the 2017 Igcse Model Questions Vol1 Chemistry examination.

Difficulty level: Medium .

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