A 0.6915-g sample of impure mercury(II) oxide was dissolved in an unmeasured excess of potassium iodide. Reaction:
HgO(s) + 4I- + H2O → HgI42-+ 2OH-
Calculate the percentage of HgO in the sample if titration of the liberated hydroxide required 40.39 Ml
of 0.1092 M HCl.
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