Post-UTME Chemistry 2011 Objective — Question 11
Question 11 of 11 from the Post-UTME Screening (Post-UTME) Chemistry 2011 Objective paper, with the correct answer and a full explanation.
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A sample of orange juice is found to have a pH of 3.80. Which is the concentration of hydroxide ion in the juice?
- A. 1.6 x 10^-4
- B. 6.3 x 10^-11Correct
- C. 6.3 x 10^-4
- D. 1.6 x 10^-11
Explanation
pOH = 14-3.80 = 10.20. [OH-] = 10^-10.20 = 6.3 x 10^-11 mol/dm^3.
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