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Equilibrium

Long Answer Type

251.

How many grammes of NaOH must be dissolved in one litre of the solution to give it a pH value of 12?

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252.

Calculate the pH of a solution obtained by mixing 150 mL of 0.1 N - NaOH and 150 ml of 0.2 N - HCl.

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253.

How does Arrhenius theory help in comparing the relative strengths of weak acids and weak bases?

150 Views

Short Answer Type

254. The dissociation constant of an acid HA is 1·6 X 10^–5. Calculate the H₃O⁺ ion concentration in its 0·01 M solution.

Here K_a of acid = 1·6 × 10^–5

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255.

Arrange the following in decreasing order of acidic strength:
(i) HOCl (K_a = 3·0 × 10^–8)
(ii) HCN (K_a = 4·0 × 10^–10)
(iii) HNO₃ (K_a = 4·5 × 10^–4)
(iv) HF (K_a = 6·7 × 10^–4)

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256. Calculate the pH of a 0·08M solution of hypochlorous acid, HOCl. The ionisation constant of the acid is 2·5 × 10^–5. Determine the percent dissociation of HOCl.

154 Views

Long Answer Type

257. At 298 K, calculate the pH of 0·23 M weak acid (ionisation constant = 7·3 × 10^–6).

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Short Answer Type

258. The ionisation constants of HF, HCOOH and HCN at 298K are 6·8 × 10^–4, 1·8 × 10^–4 and 4·8 × 10^–9 respectively. Calculate the ionisation constants of the corresponding conjugate bases.

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259. The ionisation constant of acetic acid is 1·74 × 10^–5. Calculate the degree of dissociation of acetic acid in its 0·05 M solution. Calculate the concentration of acetate ion in the solution and its pH.

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260.

It has been found that the pH of a 0.01 M solution of an organic acid is 4.15. Calculate the concentration of the anion, the ionisation constant of the acid and its pK_a.

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