1.

Statement 1 : The molar concentrations of proton aceeptor and proton donor become equal at the midpoint of titration of a weak acid. Statement 2 : The pK_(a) of a weak acid becomes equal to pH of the solution at the midpoint of its titration.

Answer»

Statement 1 is true, statement 2 is true , statement 2 is correct EXPLANATION for statement 3
Statement 1 is true, statement 2 is true , statement 2 is not a correct explanation for statement 3
Statement 1 is true, statement 2 is false
Statement 1 is false, statement 2 is true

Solution :According to Henderson-Hasselbalch equation
`pH = pK_(a) + log.(["proton acceptor"])/(["proton donor"])`
At MIDPOINT of TITRATION of weak acid
`[HA] = [A^(-)]` and HENCE `pH= pK_(a) + log 1.0 = pK_(a)`


Discussion

No Comment Found

Related InterviewSolutions