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Byju's Answer

Standard XII

Chemistry

Basic Buffer Action

In a buffer s...

Question

In a buffer solution consisting $N a H_{2} {P O}_{4}$ and ${N a}_{2} H {P O}_{4}$
(1) $N a H_{2} {P O}_{4}$ is acid and ${N a}_{2} H {P O}_{4}$ is salt
(2) The pH of solution can be calculated using the relation:
$p H = p K_{2} + {log}_{10} \frac{[H {P O}_{4}^{2 -}]}{[H_{2} {P O}_{4}^{-}]}$
(3) The ${N a}_{2} H {P O}_{4}$ is acid and $N a H_{2} {P O}_{4}$ is salt
(4) The pH cannot be calculated.

1, 2 and 3 are correct

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1 and 2 are correct

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2 and 4 are correct

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1 and 3 are correct

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Solution

The correct option is A 1, 2 and 3 are correct
$N a H_{2} P O_{4}$ and $N a_{2} H P O_{4}$ are acid salts so they can act as acid as well as salt.When one acts as acid and other as salt they will form a buffer and their $p H$ can be calculated by formula given above.

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Similar questions

H_{2} O + H_{3} {P O}_{4} ⇌ H_{3} O^{+} + H_{2} {P O}_{4}^{-}; p K_{1} = 2.15

H_{2} O + H_{2} {P O}_{4}^{-} ⇌ H_{3} O^{+} + H_{2} {P O}_{4}^{2 -}; p K_{2} = 7.20

Hence, pH of

0.01 M

N a H_{2} {P O}_{4}

is:

Q. How much

{N a}_{2} H {P O}_{4}

must be added to one litre of

0.005 M

solution of

N a H_{2} {P O}_{4}

in order to make

1 L

of the solution of

p H = 6.7

K_{1} = 7.1 \times 10^{- 3}

;

K_{2} = 6.3 \times 10^{- 8}

;

K_{3} = 4.5 \times 10^{- 13}

for

H_{3} {P O}_{4}

H_{3} {P O}_{4}

is a tribasic acid and one of its salt is

N a H_{2} {P O}_{4}

. What volume of 1M NaOH solution should be added to 12g

N a H_{2} {P O}_{4}

to convert it into

N a_{3} {P O}_{4}

? (at.wt of P=31)

Q. A buffer solution of

0.80 M

{N a}_{2} H {P O}_{4}

and

0.020 M

{N a}_{3} {P O}_{4}

is prepared. The electrolytic oxidation of

1.0

milli mole

R N H O H

is carried out in

100 m L

buffer to give.

R N H O H + H_{2} O ⟶ R {N O}_{2} + 4 H^{+} + 4 e

Calculating approximate

p H

(nearest integer) of the solution after oxidation is complete.

p K_{a_{1}}, p K_{a_{2}}

and

p K_{a_{3}}

H_{3} {P O}_{4}

are

2.12, 7.20

and

12.0

respectively.

Q. To convert 12 g of

{N a H}_{2} {P O}_{4}

complete to

{N a}_{3} {P O}_{4}

, volume of 1 M NaOH solution required is:

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In a buffer solution consisting NaH2PO4 and Na2HPO4(1) NaH2PO4 is acid and Na2HPO4 is salt(2) The pH of solution can be calculated using the relation:pH=pK2+log10[HPO2−4][H2PO−4](3) The Na2HPO4 is acid and NaH2PO4 is salt(4) The pH cannot be calculated.

The correct option is A 1, 2 and 3 are correctNaH2PO4 and Na2HPO4 are acid salts so they can act as acid as well as salt.When one acts as acid and other as salt they will form a buffer and their pH can be calculated by formula given above.

The correct option is A 1, 2 and 3 are correct
$N a H_{2} P O_{4}$ and $N a_{2} H P O_{4}$ are acid salts so they can act as acid as well as salt.When one acts as acid and other as salt they will form a buffer and their $p H$ can be calculated by formula given above.