Igcse Model Questions Vol1 2019 Chemistry Question 18

Practice objective / multiple choice question 18 from the 2019 Igcse Model Questions Vol1 Chemistry examination.

Igcse Model Questions Vol1 2019 Chemistry Objective / Multiple Choice Hard Difficulty
Question 18 IGCSE_MODEL_QUESTIONS_VOL1 • 2019 • CHEMISTRY • objective

Acetic acid (CH₃COOH) has an acid dissociation constant \(K_a = 1.8\times10^{-5}\). Each chlorine atom attached to the \(\alpha\)-carbon of a carboxylic acid increases its acidity by a factor of 10. For chloroacetic acid (ClCH₂COOH) calculate its \(K_a\) and the pH of a 0.10 M aqueous solution of the acid at 25 °C. (Ignore activity coefficients.)

Answer Options

A. Ka = 1.8×10⁻⁴; pH ≈ 3.37
B. Ka = 1.8×10⁻⁵; pH ≈ 3.37
Correct Answer C. Ka = 1.8×10⁻⁴; pH ≈ 2.37
D. Ka = 1.8×10⁻³; pH ≈ 1.87
Correct Answer
C
Correct Option:
Ka = 1.8×10⁻⁴; pH ≈ 2.37

About This Question

This is Igcse Model Questions Vol1 2019 Chemistry Question 18. It is one of the objective questions from the 2019 Igcse Model Questions Vol1 Chemistry examination.

Difficulty level: Hard .

View More Igcse Model Questions Vol1 2019 Chemistry Questions More Igcse Model Questions Vol1 Practice Questions Back to Questions

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows
Chat with Support