Alpha Question Bank for Medical: Chemistry>Chapter 5 - Equilibrium>Exercise 5>Q 48

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The salt $NaA$ of weak acid $HA$ is dissolved to form its $0.01 M$ solution. If the degree of hydrolysis is $0.01,$ the $K_{a}$ of $HA$ at $25 ° C$ is:

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Important Questions on Equilibrium

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Alpha Question Bank for Medical: Chemistry>Chapter 5 - Equilibrium>Exercise 5>Q 49

In a titration experiment,

50.0 mL

of

0.1 M HCl

is being titrated, against

0.1 M

NaOH

. The

pH

of the solution on addition of

49.9 mL

of

NaOH

is approximately:

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Alpha Question Bank for Medical: Chemistry>Chapter 5 - Equilibrium>Exercise 5>Q 50

What volume of

2 M

weak base should be added to

10 ml

of

5 M

solution of its salt with strong acid, so that

pOH = {pK}_{b}

?

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Alpha Question Bank for Medical: Chemistry>Chapter 5 - Equilibrium>Exercise 5>Q 51

The

pOH

of a basic buffer, e.g.

{NH}_{4} OH / {NH}_{4} Cl

, is

5

. If the concentration of the salt is tripled whereas that of the base remains same, what is the new value of

pOH

? (Given

\log 3 : \approx 0.48

)

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Alpha Question Bank for Medical: Chemistry>Chapter 5 - Equilibrium>Exercise 5>Q 52

What fraction of indicator is in acidic form at a solution

pH

of

5,

if

{pK}_{a}

of the indicator is

4.7 ?

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Alpha Question Bank for Medical: Chemistry>Chapter 5 - Equilibrium>Exercise 5>Q 53

To a

200 ml

of

0.1 M

weak acid

HA

solution

90 mL

of

0.1 M

solution of

NaOH

be added. Now, what volume of

0.1 M

NaOH

be added into above solution so that

pH

of resulting solution be

5

?

[(K_{a} (HA)) = 10^{- 5}]

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Alpha Question Bank for Medical: Chemistry>Chapter 5 - Equilibrium>Exercise 5>Q 54

In a saturated solution of

Mg (OH)_{2},

the concentration of

{OH}^{-}

is

6 \times 10^{- 4} M

. The

K_{sp}

of

Mg (OH)_{2}

, is:

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Alpha Question Bank for Medical: Chemistry>Chapter 5 - Equilibrium>Exercise 5>Q 55

Let the solubilities of

AgCl

in pure water,

0.01 M {CaCl}_{2}, 0.01 M NaCl & 0.05 M {AgNO}_{3} be S_{1}, S_{2}, S_{3} & S_{4}

, respectively. What is the correct order of these quantities? Neglect any complexation.

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Alpha Question Bank for Medical: Chemistry>Chapter 5 - Equilibrium>Exercise 5>Q 56

{SrCO}_{3} (K_{sp} = 10^{- 10})

and

{ZnCO}_{3} (K_{sp} = 1.5 \times 10^{- 11})

are dissolved together in a solution. The ratio of

[{Sr}^{2 +}] / [{Zn}^{2 +}]

in the solution is: