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

Decimolar weak monoprotic acid (pK_a = 4.8) is titrated with decimolar

1.	Decimolar weak monoprotic acid (pK_a = 4.8) is titrated with decimolar potash solution. What is the pH at equivalence point?
Answer» Solution :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 + log5 xx 10^2 ) = 1/2(18.8 +0.7 -2 )= 8.75 `