Because of the toxicity of mercury compounds, mercury(I) chloride is used in antibacterial salves. The mercury(I) ion (Hg₂²⁺) consists of two bound Hg⁺ ions.(c) A seawater sample contains 0.20 lb of NaCl per gallon. Find[Hg₂²⁺] if the seawater is saturated with mercury(I) chloride.