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Revisiting Tautomerism

Calculate the...

Question

Calculate the pH of the buffer solution prepared by mixing, 50 ml of 0.1 M $N H_{4} O H$ and 25 ml of 2 M $N H_{4} C I$ $(p K_{b}$ of $N H_{4} O H$ is 4.8).

5.8

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4.8

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9.2

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8.2

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Solution

The correct option is D 8.2
pOH = pKb + log(10)
pOH = 5.8
pH = 14 - pOH = 8.2

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Similar questions

20 m L

0.1 M

H_{2} S O_{4}

30 m L

0.2 M

N H_{4} O H

p H

p K_{b}

N H_{4} O H = 4.7

N H_{4} C I

N H_{4} O H

N H_{4} C I

N H_{4} O H

K_{b} (N H_{4} O H) = 1.8 * 10^{- 5}

p H = 9

N H_{4} C I

N H_{4} O H

N H_{4} C I

1.0 M

N H_{4} O H

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

N H_{4} C l

N H_{4} O H

p H = 8.7

p K_{b} o f N H_{4} O H = 4.7; antilog (0.6) = 4

20 m L

0.1 M H_{2} S O_{4}

30 m L

0.2 M N H_{4} O H

p H

[p K_{b} o f N H_{4} O H = 4.7, log 2 = 0.3010]

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