If you have an equilibrium...
HB(aq) <==> H+(aq) + B-(aq)
And the Ka = 10^(-10).... because pKa = 10
NaA is the salt of a weak acid (I assume!), so NaA is a weak base.
If you add a weak base to the reaction ...
This solution is provided in 177 words. It discusses an acid-base reaction and determines if the particular reaction will shift equilibrium to the right. It also references Le Chatelier's effect to further learning.