The monoprotic acid, HA, is dissolved in water

The monoprotic acid, HA, is dissolved in water:

The equilibrium concentrations of reactants and products are:

[HA]= 0.270 M
[H^+] = 2.00 x 10^-4 M
[A^-] = 2.00 x 10^-4 M

Calculate Ka for the acid HA:

Ka=

Calculate the value of pKa for the acid HA:

pKa=