MyQuestionIcon

1

You visited us 1 times! Enjoying our articles? Unlock Full Access!

Salt of Strong Acid and Strong Bases

A buffer solu...

Question

A buffer solution is made by dissolving by $10^{- 2}$ mole ${C H}_{3} C O O H$ and $10^{- 2}$ mole of ${C H}_{3} {C O O}^{⊖} {N a}^{\oplus}$ in 100 ml of water.
(i) What is the pH of solution ?
(ii) If this solution is poured into a container having 10,000 litre of $H_{2} O$ , then what is the new pH?

Open in App

Solution

(i) $[C H_{3} C O O H] = \frac{10^{- 2}}{100 \times 10^{- 3}} = \frac{10^{- 2}}{0.1}, [C H_{3} C O O N a] = \frac{10^{- 2}}{0.1}$
$p H = p K_{a} + log \frac{[C H_{3} C O O N a]}{[C H_{3} C O O H]} = p K_{a} + log \frac{10^{- 2} / 0.1}{10^{- 2} / 0.1}$
$p H = p K_{a}$
(ii) Total volume= $V = 10000 + 0.1 = 10000.1$
$[C H_{3} C O O H] = \frac{10^{- 2}}{V}, [C H_{3} C O O N a] = \frac{10^{- 2}}{V}$
$p H = p K_{a} + log \frac{10^{- 2} / V}{10^{- 2} / V} = p K_{a}$ .

Suggest Corrections

thumbs-up

0

Similar questions

Q. One litre of a buffer solution is prepared by dissolving

0.6

{N H}_{3}

0.4

{N H}_{4} C l

. What is the pH of the solution? for

{N H}_{3}

K_{b} = 1.85 \times 10^{- 5}

.
(i) What is the pH of the buffer after addition of

0.1

H C l

.
(ii) What is the pH of the buffer after addition of

0.1

N a O H

p H = 9.26

is made by dissolving

x

moles of ammonium sulphate and 0.1 mole of ammonia into 100 mL solution. If

p K_{b}

of ammonia is 4.74, calculate value of

x

p H

9.26

is made by dissolving

x

moles of ammonium sulphate and

0.1

mole of ammonia into

100 m L

p K_{b}

4.74

, calculate value of

x

.

Q. I. How many moles of sodium propionate should be added to one litre of an aqueous solution contain

0.02

mole of propionic acid to obtain a buffer solution of

p H

4.7

?
II. What will be the

p H

0.0005

mole of hydrogen chloride is dissolved in the above buffer solution?
III. Compare the last

p H

p H

0.01

H C l

solution.
Assume that dissociation constant of propionic acid,

25^{o} C

1.00 \times 10^{- 5}

Q. A buffer solution is formed by mixing 100 mL 0.01 M

C H_{3} C O O H

with 200 mL 0.02 M

C H_{3} C O O N a

. If this buffer solution is made to 1 lit by adding 700 mL of water,

p H

will change by a factor of:

View More

Join BYJU'S Learning Program

similar_icon

Related Videos

lock

Hydrolysis

CHEMISTRY

Watch in App

explore_more_icon

Explore more

Salt of Strong Acid and Strong Bases

Standard XII Chemistry

Join BYJU'S Learning Program

CrossIcon