Calculate [ H ₃ O ⁺ ] in 0.02 M solution of monobasic acid if dissociation constant is 1.8 10⁻⁵ .

Step-by-step solution

For a weak monobasic acid, aligned & = K _ a c = 1.8 10⁻⁵ 0.02 =3 10⁻² & [ H ₃ O ⁺ ]= c =3 10⁻² 0.02=6.0 10⁻⁴ M aligned