The toxic compound 2,4-dinitrophenol has `K_(a)=10^(-4).` In an experiment, a buffer solution of

The toxic compound 2,4-dinitrophenol has `K_(a)=10^(-4).` In an experiment, a buffer solution of 2,4-dinitrophenol was prepared with the pH adjusted to 5. Calculate the ratio of the concentrations of the dissociated ion to the undissociated acid:

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