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A sample of orange juice is found to have a pH of 3.80. What is...

Chemistry
JAMB 1992

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

  • A. 1.6 x 10-4
  • B. 6.3 x 10-11
  • C. 6.3 x 10-4
  • D. 1.6 x 10-11
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Correct Answer: Option B
Explanation

pH + pOH = 14

3.80 + pOH = 14

pOH = 14 - 3.80

pOH = 10.2

Recall that  pOH = - log [ OH\(^-\)]

                   10.2 = - log [ OH\(^-\)]

                   [ OH\(^-\)] = 10\(^{-10.2}\)

                   [ OH\(^-\)] = 6.3 x 10\(^{-11}\)

 


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