Consider the equilibrium

b(aq)+h2o(l) ⇌hb+(aq)+oh−(aq).

suppose that b(aq) is added to a solution of b at equilibrium.

a) will the equilibrium constant for the reaction increase, decrease, or stay the same? why?

b) will the concentration of hb+(aq) increase, decrease, or stay the same? why?

c) will the ph of the solution increase, decrease, or stay the same? why?

The answers are in the explanation

Explanation:

For the equilibrium:

B(aq) + H₂O(l) ⇌ HB⁺(aq) + OH⁻(aq).

By LeChatelier's principle, the increase in the concentration of a reactant (for example) at equilibrium will change the system counteracting the increasing producing more product.

Thus,

A) Will the equilibrium constant for the reaction increase, decrease, or stay the same? Why? .

The equilibrium constant is a thermodynamic constant that stay the same with the addition of a compound.

B) Will the concentration of HB⁺(aq) increase, decrease, or stay the same? Why?

By LeChatelier's principle, the addition of B will induce the formation of more HB⁺(aq) increasing the concentration.

C) Will the pH of the solution increase, decrease, or stay the same? Why?

As the addition of B induce the increasing of OH⁻, the pH of the solution will increase.

I hope it helps!