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Equilibrium

Question
CBSEENCH11008086
Wired Faculty App

The pH of a 0.1 molar solution of the acid HQ is 3. The value of the ionisation constant, Ka of this acid is

  • 3 x 10–1

  • 1 x 10–3

  • 1 x 10—5

  • 1 x 10–7

Solution

C.

1 x 10—5

HQ = H+ + Q-
left square bracket straight H to the power of plus right square bracket space equals space square root of straight K subscript straight a straight C end root space by space ostwald apostrophe straight s space dilution space law left square bracket straight H to the power of plus right square bracket space equals space 10 to the power of negative pH end exponent space equals space 10 to the power of negative 3 end exponent space straight M straight C space equals space 0.1 space straight M Thus comma space 10 to the power of negative 3 end exponent space equals space square root of straight K subscript straight a space straight x 0.1 end root 10 to the power of negative 6 end exponent space equals space straight K subscript straight a space straight x space 0.1 straight K subscript straight a space equals space 10 to the power of negative 5 end exponent

Some More Questions From Equilibrium Chapter

Which measurable property becomes constant in water vapour equilibrium?

Give an example from daily life in which there is gas solution equilibrium?

A crystal of common salt of a given mass is kept in its aqueous solution. After 24 hours, its mass remains the same. Is the crystal in equilibrium with the solution?

What is the role of forward and backward reactions at equilibrium of a reversible reaction?

What is a forward reaction?

What condition favours a reversible reaction?

What is a backward reaction?

What type of equilibrium is attained in a reversibe chemical change?

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