Question

In the reaction equilibrium
A + B C +D,
(ii) what will happen if concentration of A is increased?​

Answer 1

Answer:

A+B⇌C+D

In this reaction equilitrian,

K

c

=

[A][B]

[C][D]

If we increase the concentration of C, the numerator (top) of the K

C

expression gets bigger. That would change the value of K

C

. In order for that not to happen until a new balance is reached, the concentration of C and D have to decrease again, and those of A and B increase. That happens until a new balance is reached when the value of K

C

reverts to what it was before. The position of equilibrium moves - not because of Le-chatelier's principle says it must - but because of the need to keep the constant value of equilibrium constant (K

C

).