Neco Model Questions Vol1 2020 Chemistry Question 34

Practice objective / multiple choice question 34 from the 2020 Neco Model Questions Vol1 Chemistry examination.

Neco Model Questions Vol1 2020 Chemistry Objective / Multiple Choice Medium Difficulty
Question 34 NECO_MODEL_QUESTIONS_VOL1 • 2020 • CHEMISTRY • objective

A buffer solution is prepared by dissolving 0.250 mol of acetic acid (\(K_a = 1.8\times10^{-5}\)) and 0.150 mol of sodium acetate in 1.00 L of water. (a) Calculate the initial pH of the buffer. (b) Then 0.050 mol of HCl is added (volume change is negligible). Calculate the new pH after the acid addition. (c) Explain briefly why the buffer resists large pH changes.

Answer Options

A. Initial pH = 4.55; after HCl addition pH = 4.30
Correct Answer B. Initial pH = 4.52; after HCl addition pH = 4.27
C. Initial pH = 4.68; after HCl addition pH = 4.45
D. Initial pH = 4.40; after HCl addition pH = 4.15
Correct Answer
B
Correct Option:
Initial pH = 4.52; after HCl addition pH = 4.27

About This Question

This is Neco Model Questions Vol1 2020 Chemistry Question 34. It is one of the objective questions from the 2020 Neco Model Questions Vol1 Chemistry examination.

Difficulty level: Medium .

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