Neco 2021 Chemistry Question 19

Practice objective / multiple choice question 19 from the 2021 Neco Chemistry examination.

Neco 2021 Chemistry Objective / Multiple Choice Medium Difficulty
Question 19 NECO • 2021 • CHEMISTRY • objective

A buffer is prepared by dissolving 0.200 mol of acetic acid (Ka = 1.8 × 10^{-5}) and 0.150 mol of sodium acetate in 1.00 L of water.\n(a) Calculate the initial pH of the buffer.\n(b) After adding 0.0200 mol of HCl, calculate the new pH.\n(c) How many millilitres of 0.100 M NaOH are required to raise the pH back to its original value?

Answer Options

A. Initial pH = 4.70; pH after HCl = 4.60; NaOH volume = 210 mL
Correct Answer B. Initial pH = 4.62; pH after HCl = 4.52; NaOH volume = 200 mL
C. Initial pH = 4.62; pH after HCl = 4.40; NaOH volume = 200 mL
D. Initial pH = 4.55; pH after HCl = 4.45; NaOH volume = 190 mL
Correct Answer
B
Correct Option:
Initial pH = 4.62; pH after HCl = 4.52; NaOH volume = 200 mL

About This Question

This is Neco 2021 Chemistry Question 19. It is one of the objective questions from the 2021 Neco Chemistry examination.

Difficulty level: Medium .

View More Neco 2021 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