Neco 2020 Chemistry Question 13

Practice objective / multiple choice question 13 from the 2020 Neco Chemistry examination.

Neco 2020 Chemistry Objective / Multiple Choice Hard Difficulty
Question 13 NECO • 2020 • CHEMISTRY • objective

0.250 M benzoic acid \(C_{6}H_{5}COOH\) (literature \(K_{a}=6.3\times10^{-5}\)) is partially neutralised with 0.050 mol NaOH in a total volume of 250.0 mL. The pH of the resulting solution is measured as 4.20. Using this data, calculate the experimental \(K_{a}\) value and the percentage error relative to the literature value.

Answer Options

A. 3.8\\times10^{-4}\\, (K_a), 500\\% error
Correct Answer B. 2.5\times10^{-4}\, (K_a), 302\% error
C. 6.3\\times10^{-5}\\, (K_a), 0\\% error
D. 1.2\\times10^{-4}\\, (K_a), 90\\% error
Correct Answer
B
Correct Option:
2.5\times10^{-4}\, (K_a), 302\% error

About This Question

This is Neco 2020 Chemistry Question 13. It is one of the objective questions from the 2020 Neco Chemistry examination.

Difficulty level: Hard .

View More Neco 2020 Chemistry Questions More Neco 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