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You are watching: Ph=1/2(pka-logc)
A- + H2O; HA + OH-
Here HA is weak acid taken into consideration.
As instance, the salt CH3COONa. It ionises in water entirely to give CH3COO- and Na+ ions. CH3COO- ions react via water to create a weak acid, CH3COOH and also OH- ions.
CH3COO- + H2O CH3COOH + OH-
C(1-x) Cx Cx
Thus, OH- ion concentration rises, the solution becomes alkaline.
From legislation of mass activity,
Other equations present in the solution are:
CH3COOH CH3COO- + H+,
H2O H+ + OH-,
From eqs. (ii) and (iii),
-pOH = -pKw + pKa + log
pKw - pOH = pKa + log
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