Calculate the ratio of F- and HCOO- in a mixture of 0.1 M HF (Ka=6.6×10-4) and 0.2 M HCOOH (Ka=2×10-4).

1. 2 : 2.3

2. 1 : 3.3

3. 3.3 : 2

4. 3.3 : 1

Subtopic:  Ionisation Constant of Acid, Base & Salt |
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A buffer solution is prepared by mixing 10 mL of 1.0 M acetic acid with 20 mL of 0.5 M sodium acetate which is then diluted
to 100 mL with distilled water. If the pKa of CH3COOH is 4.76, the pH of the buffer solution prepared is -
1. 5.21

2. 4.76

3. 4.34

4. 5.35

Subtopic:  Buffer |
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The pH of a solution obtained by mixing equal volume of solutions having pH=3 and pH=4. [log 5.5=0.7404]

1. 3.26

2. 3.5

3. 4.0

4. 3.42

Subtopic:  pH calculation |
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Solid AgNO3 is added slowly to a buffer solution of pH=10 to precipitate AgOH. The [Ag+] concentration in the solution is [Ksp(AgOH)=10-10]

1. 10-4 M

2. 10-5 M

3. 10-6 M

4. 10-7 M

Subtopic:  pH calculation |
 62%
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If pKb for CN- at 25°C is 4.7, the pH of 0.5 M aqueous NaCN solution is

1. 10

2. 11.5

3. 11

4. 12

Subtopic:  pH calculation |
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A buffer solution is prepared by mixing 20 ml of 0.1 M CH3COOH and 40 ml of 0.5 M CH3COONa and then diluted by adding 100 ml of distilled water. The pH of the resulting buffer solution is (Given pKa CH3COOH=4.76)

1. 5.76

2. 3.67

3. 2.48

4. 4.76

Subtopic:  pH calculation |
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An acid-base indicator has Ka=3.0×10-5. The acid form of the indicator is red and the basic form is blue. The [H+] required to change the indicator from 75% red to 75% blue is

1. 8×10-5 M

2. 9×10-5 M

3. 1×10-5 M

4. 3×10-4 M

Subtopic:  Salt Hydrolysis & Titration |
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The self-ionization constant for pure formic acid, K = [\(H C O O H_{2}^{+} \left]\right. \left[\right. H C O O^{-} \left]\right.\) ] has been estimated as \(\left(10\right)^{- 4}\) at room temperature. The percentage of formic acid molecules in pure formic acid that are converted to formate ions is

\(\left(\right. Given : d_{HCOOH} = 1 . 22\ g / cc \left.\right)\)

1. 0.0185%

2. 0.0073%

3. 0.074%

4. 0.037%

Subtopic:  Ionisation Constant of Acid, Base & Salt |
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AgOH is added to NaCl solution to form AgCl precipitate. After the precipitation, the pH of the solution is 8. The [Cl-] is (Ksp of AgCl=10-12, Ksp of AgOH=10-10)

1. 10-6 M

2. 10-4 M

3. 10-8 M

4. 10-10 M

Subtopic:  pH calculation |
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For the reaction 
[Ag(CN)2]-(aq)Ag+(aq)+2CN-(aq),the equilibrium constant at 25°C is 4.0×10-19. The silver ion concentration in a solution that was originally 0.10 M in KCN and 0.03 M in AgNO3 will be:

1. 2.5×10-18 M

2. 1.5×10-18 M

3. 5.5×10-18 M

4. 7.5×10-18 M

Subtopic:  Salt Hydrolysis & Titration |
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