Question

CrO4-2 Ion/Cr2O7-2 Ion Equilibrium

Answer 1

Answer:

We write chemical equilibrium equation:

2CrO4^{2-} + 2H3O^+ = Cr2O7^{2-} + 3H2O2CrO4

2−

+2H3O

+

=Cr2O7

2−

+3H2O

To solve this task, we must use Le Chatelier rule.

(i)

An increase in the concentration of the dichromate ion shifts the chemical equilibrium towards the starting materials (to the left).

(ii)

The addition of hydrochloric acid shifts the chemical equilibrium towards the formation of reaction products (to the right).

Explanation:

(i)

An increase in the concentration of the dichromate ion shifts the chemical equilibrium towards the starting materials (to the left).

(ii)

The addition of hydrochloric acid shifts the chemical equilibrium towards the formation of reaction products (to the right).