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w przypadku kw. jednoprotonowego [H⁺]=[X⁻], zatem
K = [H⁺]²/[HX]
[HX] = [H⁺]²/K
[HX] = 0,01²/10⁻³ = 10⁻⁴/10⁻³ = 0,1 mol/dm³
C = [HX] + [H⁺] = 0,1 + 0,01 = 0,11 mol/dm³ - takie jest całkowite stężenie kwasu HX.