Problem: 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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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

[A] = 2.00 × 10-4

Calculate the Ka value for the acid HA.