The pH of 0.025 M [OH-] solution would be 12.4
The pH is the degree of acidity or alkalinity of a substance.
Mathematically,
pH = 14 - pOH
pH = -log [H+]
pOH = -log [OH-]
In this case, [OH-] = 0.025 M
Thus
pOH = -log [OH-]
= -log 0.025
= 1.6
pH = 14 - 1.6
= 12.4
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