Hg2+ is more water soluble, methyl mercury HgCH3+ is more lipid soluble. CH3Hg, polar molecules would combine to form a substance similar to water but would be more acidic as a result of mixing two non-like particles in a solution Solution Hg2+ is more water soluble, methyl mercury HgCH3+ is more lipid soluble. CH3Hg, polar molecules would combine to form a substance similar to water but would be more acidic as a result of mixing two non-like particles in a solution.