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Then add a few drops of solution of mercuric chloride; the surface of the mercury will become level, read and record its new position.

Double salts of cerous chloride with stannic chloride, mercuric chloride, and platinic chloride are also known.

The supporters of the formula Hg2Cl2 pointed out that dissociation into mercury and mercuric chloride would give this value, since mercury is a monatomic element.

In all these cases of partial decomposition some of the mercurous chloride—the calomel—is changed into soluble mercuric chloride and metallic mercury.

It is true that mercuric chloride is very effective, but I cannot think of a single modern reason to use it.