179. Sediment contains barium sulfate and mercury(I) chloride. Specify which reagent should be used to separate barium and mercury(I) cations:
A. treat with ammonia solution;
B. treat with a solution of dilute sulfuric acid;
C. treat with a solution of ammonium acetate;
D. treat with concentrated nitric acid;
E. treat with a solution of acetic acid.
Write an equation for the corresponding reaction.

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