The pH of glycine at the first half equivalence point is 2.34 and that at second half equivalence point is 9.60.At the equivalence point (The first inflection point) The pH is :

(1) 3.63

(2) 2.34

(3) 5.97

(4) 11.94

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A 1.458 g of Mg reacts with 80.0 ml of a HCI solution whose pH is –0.477. The change in pH after all Mg has reacted. (Assume constant volume. Mg = 24.3 g/mol.)(log 3 = 0.477)

(1) –0.176

(2) +0.477

(3) –0.2385

(4) 0.3

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Find the pH (initial pH –final pH) when 100 ml 0.01 M HCl is added in a solution containig 0.1 m molesof NaHCO3 solution of negligible volume ( Kai =10–7, Ka, =10–11 for H2CO3) :

(1) 6 + 2 log3

(2) 6 – log3

(3) 6 + 2Iog2

(4) 6 – 21°93

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The ionization constant of benzoic acid is 6.46 x 10–5 and Kc for silver benzoate is 2.5 x 10–13. How many times silver benzoate is more soluble in a buffer of pH = 3.19 as compared to its solubility in pure water ?

(1) 3.317

(2) 9.5

(3) 1000

(4) 7.5

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Introduction To Equilibrium
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30 ml of 0.06 M solution of the protonated form of an anion acid methonine (H2A+) is treated with 0.09 MNaOH. Calculate pH after addition of 20 ml of base. pKa 1, = 2.28 and pKa2 = 9.2.

(1) 5.5

(2) 5.74

(3) 9.5

(4) None

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A certain acid–base indicator is red in acid solution and blue in basic solution 75% of the indicator is presentin the solution in its blue form at pH = 5. Calculate the pH at which the indicator shows 90% red form?

(1) 3.56

(2) 5.47

(3) 2.5

(4) 7.4

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Ionisation constant of HA (weak acid) and BOH (weak base) are 3.0 x 10–7 each at 298K. The percent degree of hydrolysis of BA at the dilution of 10L is :

1. 25

2. 50

3. 75

4. 40

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Salt Hydrolysis
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Calculate the molar solubility of zinc tetrathiocyanato–N–mercurate (II) if its Ksp = 2.2 x 10–7.

(1) 0.00380

(2) 0.000469

(3) 0.0095

(4) 0.0183

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Solubility Product
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An acid–base indicator which is a weak acid has a pKa value = 5.45. At what cocentration ratio of sodiumacetate to acetic acid would the indicator show a colour half–way between those of its acid and conjugate base forms? pKa of acetic acid = 4.75. [log 2 = 0.3]

(1) 4 : 1

(2) 7 : 1

(3) 5 : 1

(4) 2 : 1

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The indicator constant of phenolphthalein is approximately 10–10. A solution is prepared by adding 100.01c.c. of 0.01 N sodium hydroxide to 100.00 c.c. of 0.01N hydrochloric acid. If a few drops of phenolphthalein are now added, what fraction of the indicator is converted to its coloured form?

(1) 23

(2) 34

(3) 12

(4) 911

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Ki for Acid & Base
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