The ionisation constant of acetic acid is 1·74 × 10–5. Calcu

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 Multiple Choice QuestionsLong 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?

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 Multiple Choice QuestionsShort 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.
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255.

Arrange the following in decreasing order of acidic strength:
(i) HOCl (Ka = 3·0 × 10–8)
(ii) HCN (Ka = 4·0 × 10–10)
(iii) HNO3 (Ka = 4·5 × 10–4)
(iv) HF (Ka = 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. 
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 Multiple Choice QuestionsLong 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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 Multiple Choice QuestionsShort 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. 


The dissociation of acetic acid may be represented as

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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 pKa.

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