Chemistry Class-11: Chapter –7. Equilibrium Part – 5

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Question: 28

The value of for the reaction

At a given time, the composition of reaction mixture is

In which direction will the reaction proceed?

Answer:

At a given time the reaction quotient Q for the reaction will be given by the expression.

As the value of reaction quotient is greater than the value of the reaction will proceed in the reverse direction.

Question: 29

On the basis of the equation , the of solution of should be . However, it is observed to be less than . Explain the reason.

Answer:

Concentration of indicates that the solution is very dilute. Hence, the contribution of concentration from water is significant and should also be included for the calculation of .

Question: 30

of a solution of a strong acid is . What will be the of the solution obtained after diluting the given solution a times?

Answer:

(i)

On times dilution

On calculating the pH using the equation , value of comes out to be . It is not possible. This indicates that solution is very dilute. Hence,

Question: 31

A sparingly soluble salt gets precipitated only when the product of concentration of its ions in the solution becomes greater than its solubility product. If the solubility of in water is . Calculate its solubility in of .

Answer:

for in water

But

Since value of will not change in the presence of sulphuric acid, therefore from (1) and (2)

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