AP EAMCET · Chemistry · Ionic Equilibrium

Statement \(\mathbf{A}: \mathrm{pH}\) of buffer increases with increasing temperature.
Statement B : The value of \(K_W\) of water decreases with decreasing temperature.

A \(\mathrm{A}\) is correct, but \(\mathrm{B}\) is wrong.
B Both \(\mathrm{A}\) and \(\mathrm{B}\) are correct
C Both \(\mathrm{A}\) and \(\mathrm{B}\) are wrong
D \(\mathrm{A}\) is wrong but \(\mathrm{B}\) is correct

Verified Solution

Answer & Solution

Correct Answer

(B) Both \(\mathrm{A}\) and \(\mathrm{B}\) are correct

Step-by-step Solution

Detailed explanation

Dissociation of electrolytes increases with increase in temperature: So, \(\mathrm{K}_{\mathrm{w}}=\left[\mathrm{H}^{+}\right]\left[\mathrm{OH}^{-}\right]\)also increases. \(\therefore \quad\) pH of the buffer solution increases.

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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Statement \(\mathbf{A}: \mathrm{pH}\) of buffer increases with increasing temperature.Statement B : The value of \(K_W\) of water decreases with decreasing temperature.

Step-by-step Solution

Statement \(\mathbf{A}: \mathrm{pH}\) of buffer increases with increasing temperature.
Statement B : The value of \(K_W\) of water decreases with decreasing temperature.