Why equilibrium favours weak acid or weak base

[Titan97]

Homework Statement

Which side does the equilibrium favour?

Homework Equations

Equilibrium favours weak acid or weak base (I don't know why )

The Attempt at a Solution

Using the given pka values, since the reactant is the weaker acid, reactants are favoured. (Backward reaction is favoured).
But why does equilibrium favour weak acid or weak base?

 

[Borek]

Try to express the K of the reaction using Ka values for both acids.

 

[Titan97]

$k=10^{-0.6}$

 

[Borek]

That's your answer, isn't it?

 

[Titan97]

Yes.