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261. The pH of 0·005M codeine (C₁₈H₂₁NO₃) solution is 9·95. Calculate its ionization constant and pK_b.

We know,

The concentration of codeine ion is also same as that of hydroxyl ion. The concentration of the ions is very small and hence the concentration of undissociated base can be taken as equal to 0·005 M.

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262. What is the pH of 0·001M aniline solution? The ionisation constant of aniline is 4·27 × 10^–10.
Calculate the degree of ionisation of aniline in the solution. Also,calculate the ionisation constant of the conjugate acid of aniline.

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Short Answer Type

263. The ionisation constant of dimethylamine is 5·4 × 10^–4. Calculate its degree of ionisation in its 0-02M solution. What percentage of dimethylamine is ionised if the solution is also 0·1M in NaOH?

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Long Answer Type

264. The ionisation constant of phenol is 1·0 × 10^–10. What is the concentration of phenolate ion in a 0·05W solution of phenol? What be its degree of ionisation if the solution is also 0·01M in sodium phenolate?

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Short Answer Type

265. The pH of 0·0041M hydrazine solution is 9·7. Calculate the ionisation constant K_b and pK_b.

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266. The degree of ionisation of a 0·1M bromoacetic acid solution is 0·132. Calculate the pH of the solution and pK_a of bromoacetic acid.

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Long Answer Type

267.

At 298 K, calculate the pH of 0.200 M solution of methylamine, CH₃NH₂(ionisation constant = 4·4×10⁵).

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Short Answer Type

268.

The pH of 0.1 M solution of cyanic acid (HCNO) is 2.34. Calculate the ionisation constant of the acid and its degree of ionisation in the solution.

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Long Answer Type

269.

The ionisation constant of propanoic acid is 1·32 × 10^–5. Calculate the degree of ionisation of the acid in its 0·05M solution and also it's pH. What will be its degree of ionisation if the solution is 0·01M in HCl also?

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Short Answer Type

270.

The pH of 0.1 M monobasic acid is 4.50. Calculate the concentration of species H⁺, A^– and HA at equilibrium. Also, determine the values of K_a and pK_a of the monobasic acid. A and HA at equilibrium. Also, determine the values of K_a and pK_a of the monobasic acid.