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Show that degree of hydrolysis of a salt of weak acid and weak base is independent of concentration of the solution.
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Derive the relation, $straight alpha space equals square root of fraction numerator straight K subscript straight w over denominator straight K subscript straight a. space straight K subscript straight b space end fraction end root$ in case of hydrolysis of a salt of weak acid and weak base.

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Short Answer Type

285. A 0·02M solution of pyridinium hydrochloride has pH = 3·44. Calculate the ionisation constant of pyridine.

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Long Answer Type

286.
The ionisation constant of nitrous acid is 4·5 × 10^–4. Calculate the pH of 0·04M sodium nitrite solution and also its degree of hydrolysis.

Sodium nitrite is a salt of a strong base and a weak acid. Its degree of hydrolysis, h is given by the relation:

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Short Answer Type

287.

The pK_a of acetic acid and pK_b of ammonium hydroxide are 4·76 and 4·75 respectively. Calculate the pH of ammonium acetate solution.

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Long Answer Type

288. Determine the degree of hydrolysis, hydrolysis constant and pH of 0·02N of sodium acetate. The dissociation constant of acetic acid is 1·8×10^–5, K_w = 10^–14.

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