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Decimolar weak monoprotic acid (pKa = 4....

Decimolar weak monoprotic acid `(pK_a = 4.8)` is titrated with decimolar potash solution.
What is the pH at equivalence point?

Text Solution

Verified by Experts

At equivalence point, HA+KOH `to` KA+`H_2 O`
Salt hydrolysis of salt of weak acid and strong base takes place
`pH = 1/2 (PK_w + PK_a + log C)`, where .C. is one-half of that of the acid, because equal volume of base is added for its neutralisation.
` pH = 1/2 ( 14+4.8 + log 5 xx 10^2 ) = 1/2 (18.8 +0.7 -2 )= 8.75 `
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