(chemistry, obsolete) Mercuric oxide (HgO), a heavy red crystalline powder obtained by heating mercuric nitrate, or by heating mercury in the air.
Red-precipitate Sentence Examples
With silver nitrate it gives an orange red precipitate of silver ferricyanide, Ag 3 Fe(NC)s.
Normal chromates on the addition of silver nitrate give a red precipitate of silver chromate, easily soluble in ammonia, and with barium chloride a yellow precipitate of barium chromate, insoluble in acetic acid.
Cerium compounds may be recognized by the red precipitate of ceric hydroxide, which is formed when sodium hypochlorite is added to a colourless cerous salt.
A characteristic reaction is the formation of a red precipitate of cuprous hydride, Cu 2 H 21 when heated with copper sulphate solution to 60°.