passwella.
Menu

JAMB Chemistry 1992 Question 18

Question 18

Acids, Bases and Salts

A sample of orange juice is found to have a pH of 3.80. What is the concentration of the hydroxide ion in the juice?

  1. A.1.6 × 10−4
  2. B.6.3 × 10−11
  3. C.6.3 × 10−4
  4. D.1.6 × 10−11.
Show the answer and explanation

Answer: B (6.3 × 10−11)

Explanation

pOH = 14 − 3.80 = 10.20, so [OH−] = 10−10.2 ≈ 6.3 × 10−11 mol/dm3.