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The $p K_{b}$ value of ammonium hydroxide is 4.75. An aqueous solution of ammonium hydroxide is titrated with HCl. The pH of the solution at the point where half of the ammonium hydroxide has been neutralized will be

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Important Questions on Equilibrium

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Chemistry>Physical Chemistry>Equilibrium>Buffer Solutions

Among the following, the correct statement is

HARD

Chemistry>Physical Chemistry>Equilibrium>Buffer Solutions

A solution of

0.1

mole of

{CH}_{3} {NH}_{2} (K_{b} = 5 \times 10^{- 4})

and

0.08 mole

HCl

is diluted to one litre, then the

pOH

of the solution is

(\log 1.25 = 0.1)

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Chemistry>Physical Chemistry>Equilibrium>Buffer Solutions

Which of the following mixtures will have the lowest pH at $298 K ?$

EASY

Chemistry>Physical Chemistry>Equilibrium>Buffer Solutions

For a buffer of a mixture of

0.12 mol L^{- 1}

{CH}_{3} COOH

and

0.12 mol L^{- 1} {CH}_{3} COONa,

the buffer capacity is

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Chemistry>Physical Chemistry>Equilibrium>Buffer Solutions

Which will make basic buffer?

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Chemistry>Physical Chemistry>Equilibrium>Buffer Solutions

What will be the

pH

of solution formed by mixing

10 mL 0.1 {MNaH}_{2} {PO}_{4}

15 mL

0.1 {MNa}_{2} {HPO}_{4}

[Given:

{pK}_{1} = 2.12, {pK}_{2} = 7.2]

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Chemistry>Physical Chemistry>Equilibrium>Buffer Solutions

If the

pH

of a solution containing

10 mL

0.5 M {CH}_{3} COOH

and

10 mL

0.25 M NaOH

5

. What is the

{pK}_{a}

of the acid?

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Chemistry>Physical Chemistry>Equilibrium>Buffer Solutions

Which among the following pairs is not an acidic buffer?

HARD

Chemistry>Physical Chemistry>Equilibrium>Buffer Solutions

3 g

of acetic acid is added to

250 m L

0.1 M H C l

and the solution made up to

500 m L

. To

20 m L

of this solution

\frac{1}{2} m L

5 M N a O H

is added. The

p H

of the solution is ________
[Given:

p K a

of acetic acid

= 4.75,

molar mass of acetic acid

60 g / m o l, \log 3 = 0.4771

, Neglect any changes in volume]

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Chemistry>Physical Chemistry>Equilibrium>Buffer Solutions

An acidic buffer is obtained on mixing:

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Chemistry>Physical Chemistry>Equilibrium>Buffer Solutions

In order to prepare a buffer solution of

pH 5.74

, sodium acetate is added to acetic acid. If the concentration of acetic acid in the buffer is

1.0 M,

the concentration of sodium acetate in the buffer is ______

M .

(Round off to the Nearest Integer).

[Given : pKa (acetic acid) = 4.74]

EASY

Chemistry>Physical Chemistry>Equilibrium>Buffer Solutions

Addition of sodium hydroxide solution to a weak acid (HA) results in a buffer of pH 6. If ionization constant of HA is

10^{- 5}

, the ratio of salt to acid concentration in the buffer solution will be:

HARD

Chemistry>Physical Chemistry>Equilibrium>Buffer Solutions

The negative logarithm of dissociation constant of

{NH}_{4} OH

4.745

. A buffer solution contains

0.035

mole

{NH}_{4} OH

and

0.35

mole

{NH}_{4} Cl

per litre. The

pH

of the buffer solution is

HARD

Chemistry>Physical Chemistry>Equilibrium>Buffer Solutions

A buffer solution can be prepared by mixing equal volumes of

MEDIUM

Chemistry>Physical Chemistry>Equilibrium>Buffer Solutions

The

{OH}^{-}

concentration in a mixture of

5.0 mL

0.0504 M {NH}_{4} Cl

and

2 mL

0.0210 M {NH}_{3}

solution is

x \times 10^{- 6} M

. The value of

x

is (Nearest integer) [Given

K_{w} = 1 \times 10^{- 14}

and

K_{b} = 1.8 \times 10^{- 5}]

EASY

Chemistry>Physical Chemistry>Equilibrium>Buffer Solutions

Calculate the

pH

of a solution containing

0.2 M {CH}_{3} COOH

and

0.1 M {CH}_{3} COONa .

The

K_{a}

{CH}_{3} COOH = 1.8 \times 10^{- 5} (- \log (1.8 \times 10^{- 5}) = 4.74)

EASY

Chemistry>Physical Chemistry>Equilibrium>Buffer Solutions

If the molar concentrations of base and its conjugate acid are same, then

pOH

of the buffer solution is

HARD

Chemistry>Physical Chemistry>Equilibrium>Buffer Solutions

A solution of $0.1 M$ weak base $(B)$ is titrated with $0.1 M$ of a strong acid $(HA)$ . The variation of $pH$ of the solution with the volume of $HA$ added is shown in the figure below. What is the ${pK}_{b}$ of the base? The neutralisation reaction is given by $B + HA \to {BH}^{+} + A^{-}$ .

Question Image

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Chemistry>Physical Chemistry>Equilibrium>Buffer Solutions

50 mL

0 .2 M

ammonia solution is treated with

25 mL of 0.2 M HCl

. If

{pK}_{b}

of ammonia solution is

4.75

, the

pH

of the mixture will be:

EASY

Chemistry>Physical Chemistry>Equilibrium>Buffer Solutions

Which one of the following pairs of solution is not an acidic buffer?

The pKb value of ammonium hydroxide is 4.75. An aqueous solution of ammonium hydroxide is titrated with HCl. The pH of the solution at the point where half of the ammonium hydroxide has been neutralized will be

Important Questions on Equilibrium

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The $p K_{b}$ value of ammonium hydroxide is 4.75. An aqueous solution of ammonium hydroxide is titrated with HCl. The pH of the solution at the point where half of the ammonium hydroxide has been neutralized will be