Neco Model Questions Vol1 2022 Chemistry Question 46

Practice objective / multiple choice question 46 from the 2022 Neco Model Questions Vol1 Chemistry examination.

Neco Model Questions Vol1 2022 Chemistry Objective / Multiple Choice Medium Difficulty
Question 46 NECO_MODEL_QUESTIONS_VOL1 • 2022 • CHEMISTRY • objective

A solution contains a weak acid HA (Ka = 1.8\times10^{-5}) and its sodium salt NaA. The pH of the solution is 5.00. (a) Determine the ratio \([A^-]/[HA]\). (b) If the total concentration of the acid species \([HA] + [A^-]\) is 0.250\,M, calculate the concentration of NaA in the solution.

Answer Options

Correct Answer A. ratio = 1.80; [NaA] = 0.161 M
B. ratio = 2.50; [NaA] = 0.120 M
C. ratio = 0.56; [NaA] = 0.200 M
D. ratio = 1.20; [NaA] = 0.180 M
Correct Answer
A
Correct Option:
ratio = 1.80; [NaA] = 0.161 M

About This Question

This is Neco Model Questions Vol1 2022 Chemistry Question 46. It is one of the objective questions from the 2022 Neco Model Questions Vol1 Chemistry examination.

Difficulty level: Medium .

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