The dissociation can be represented as follows:
\[ \mathrm{HF} \rightleftharpoons \mathrm{H}^{+} + \mathrm{F}^{-} \]
The equilibrium concentrations can be represented as:
\[ [\mathrm{HF}] = 0.20 - x \]
\[ [\mathrm{H}^{+}] = x \]
\[ [\mathrm{F}^{-}] = x + 0.20
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