Gce Model Questions Vol1 2022 Chemistry Question 20

Practice objective / multiple choice question 20 from the 2022 Gce Model Questions Vol1 Chemistry examination.

Gce Model Questions Vol1 2022 Chemistry Objective / Multiple Choice Medium Difficulty
Question 20 GCE_MODEL_QUESTIONS_VOL1 • 2022 • CHEMISTRY • objective

A 0.500 L solution contains 0.050 mol of the weak acid HA (Ka = 1.8 × 10\(^{-5}\)). It is titrated with 0.10 M NaOH. (a) After adding 20.0 mL of NaOH, calculate the pH of the mixture. (b) After enough NaOH has been added to reach the equivalence point, the total volume is adjusted to 1.00 L. Calculate the pH at the equivalence point.

Answer Options

Correct Answer A. pH after 20 mL NaOH ≈ 3.36; pH at equivalence ≈ 8.72
B. pH after 20 mL NaOH ≈ 3.10; pH at equivalence ≈ 8.50
C. pH after 20 mL NaOH ≈ 3.80; pH at equivalence ≈ 9.00
D. pH after 20 mL NaOH ≈ 3.20; pH at equivalence ≈ 8.30
Correct Answer
A
Correct Option:
pH after 20 mL NaOH ≈ 3.36; pH at equivalence ≈ 8.72

About This Question

This is Gce Model Questions Vol1 2022 Chemistry Question 20. It is one of the objective questions from the 2022 Gce Model Questions Vol1 Chemistry examination.

Difficulty level: Medium .

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