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Updated: July 21, 2026
It is essential that the solution should be cold and that the stannous chloride should not be present in great excess, otherwise a secondary reaction takes place, resulting in the reduction of the mercurous chloride to metallic mercury: SnCl + 2HgCl > SnCl + 2Hg. Heat at a temperature just below boiling until the undissolved residue is white or until solvent action has ceased.
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