TS EAMCET · Chemistry · Ionic Equilibrium

If the molar concentrations of base and its conjugate acid are same, then $pOH$ of the buffer solution is

A same as ${pK}_{b}$ of base
B same as ${pK}_{a}$ of base
C same as ${pK}_{a}$ of acid
D same as ${pK}_{b}$ of acid

Verified Solution

Answer & Solution

Correct Answer

(A) same as ${pK}_{b}$ of base

Step-by-step Solution

Detailed explanation

According to the buffer solution the pOH of solution is :- pOH=pKb + logSaltbase If the molar concentrations of base and its conjugate acid are same then Salt=Base So, the pOH=pKb + log1=pKb+0=pKb Hence, if the molar concentrations of base and its conjugate…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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If the molar concentrations of base and its conjugate acid are same, then pOH of the buffer solution is

Step-by-step Solution

If the molar concentrations of base and its conjugate acid are same, then $pOH$ of the buffer solution is