what is the base ionization constant expression for ammonia?

The base ionization constant expression for ammonia, also known as the ammonia dissociation constant, can be written as:

Kb = [NH4+][OH-] / [NH3]

where:
- Kb represents the base ionization constant for ammonia
- [NH4+] represents the concentration of ammonium ions
- [OH-] represents the concentration of hydroxide ions
- [NH3] represents the concentration of ammonia molecules

The expression shows that when ammonia (NH3) reacts with water (H2O), it can accept a proton (H+) to form ammonium ions (NH4+) and hydroxide ions (OH-).

Please note that the specific value of Kb for ammonia can vary depending on the temperature and concentration of the solution.

You don't have that is a table. I think it's 1.8E-5.