A monoprotic acid, HA, is dissolved in water:
HA + H2O ⇌ H3O+ + A-
The equilibrium concentrations of the reactants and products are
[HA] = 0.170 M
[H3O+] = 2.00 × 10-4 M
[A] = 2.00 × 10-4 M
Calculate the Ka value for the acid HA.
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