The waste water of a certain large colony contains 10–

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M: +1.00/-0.33

The waste water of a certain large colony contains 10^–5.6 mmol/l of OH^{– ions} at 25 ºC.
The pH of this sample is

[ESE (IES) CE 2016 P2]

A 8.6

B 7.9

C 5.4

D 4.5