Answer:
1. LiOH : strong base
2. HF : weak acid
3. HCl : strong acid
4. NH3 : weak base
Ka expression: Ka = [A- ] * [H+] / [HA]
Explanation:
The Acidity Constant:
The acid dissociation constant, Ka, (or acidity constant, or acid ionization constant) is a measure of the strength of a weak acid (which is not completely dissociated):
HA ↔ A- + H +
HA is a generic acid that dissociates into A- (the conjugate base of the acid), and the hydrogen or proton ion, H +.
The dissociation constant Ka is written as the ratio of equilibrium concentrations (in mol / L):
Ka = [A- ] * [H+] / [HA]
When we write in square brackets, we refer to the concentration of that element.
