SATHEE: Equilibrium Question 851

Equilibrium Question 851

Question: If $p K_{b}$ for fluoride ion at $25^{\circ} C$ is 10.83, the ionisation constant of hydrofluoric acid in water at this temperature is

Options:

A) $3.52 \times 10^{- 3}$

B) $6.75 \times 10^{- 4}$

C) $5.38 \times 10^{- 2}$

D) $1.74 \times 10^{- 5}$

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Answer:

Correct Answer: B

Solution:

$K_{w} = K_{a} \times K_{b}$

$K_{b} = 10^{- 10.83} = 1.48 \times 10^{- 11}$

$∴ K_{a} = \frac{K_{w}}{K_{b}} = \frac{10^{- 14}}{1.48 \times 10^{- 11}} = 6.75 \times 10^{- 4}$

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Equilibrium Question 851

Question: If pKb for fluoride ion at 25∘C is 10.83, the ionisation constant of hydrofluoric acid in water at this temperature is

Options:

Answer:

Solution:

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Question: If $p K_{b}$ for fluoride ion at $25^{\circ} C$ is 10.83, the ionisation constant of hydrofluoric acid in water at this temperature is