The pH of a solution is 5.5 at 25°C. Calculate its [OH-]. – InterviewSolution

1.

The pH of a solution is 5.5 at 25°C. Calculate its [OH-].

Answer»

pH = 5.5

Since pH + pOH = 14

pOH = 14 – pH

= 14 – 5.5 = 8.5

[OH^-] = 10^-POH

= 10^-8.5

= 3.16 × 10^-9 M

(OR)

[OH^-] = antilog[-8.5]

= 3.16 × 10^-9 M

[OH^-] = 3.16 × 10^-9 M

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