Question

A double replacement reaction occurs when aqueous potassium iodide and aqueous mercury (I) nitrate are mixed. What is the correct balanced chemical equation for this reaction? (1 point) KI(aq) + HgNO3 (aq) yields KHg(aq) + INO3(s) KI(aq) + HgINO3 (aq) yields KNO3 (aq) + Hg(s) KI2 (aq) + HgNO3 (aq) yields KNO3 (aq) + HgI2 (s) KI(aq) + Hg2NO3 (aq) yields KNO3(aq) + Hg2I(s)

Answer 1

The answer should be 2KI(aq)+Hg(NO3)2(aq) = 2KNO3(aq) + HgI2(s). This is a double replacement reaction, the valence of elements will not change. The HgI2 is not soluble in water.