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nitro-muriatic acid.

of potash. These singular combinations seem to be owing, tothe stronger attraction of the alcali to muriatic, than to oxigena-ted muriatic acid, assisted by the attraction which the latter hasfor a still larger portion of oxigen.

Oxigcnated muriate of soda or lime, may be obtained in asimilar manner. The method of producing oxigenated muriateof strontia has been noticed before, page 245.

Oxigenated muriate of copper is obtained by dissolving theoxid of copper in cold muriatic acid, or dissolving copper by heatin muriatic acid. Oxigenated muriate of iron is produced by dis-solving the red oxid of iron in muriatic acid. Oxigenated mu-riate of tin is produced by passing oxigenated muriatic acid gasthrough a solution of muriate of tin. Oxigenated muriate of leadis obtained in a similar manner.

NITRO-MURIATIC ACID.

Nitro-muriatic acid is a mixt or compound acid analogous tothe former. It was formerly known by the name o t' aqua regia.It is produced by adding muriatic acid to the nitric: orle part ofthe former is generally added to two of the latter.

During this combination an effervescence takes place, heat isliberated, and oxigenated muriatic acid gas becomes evolved;this action may be assisted and prolonged by the application ofheat. The mixture assumes a yellow colour. It has the pro-perty of dissolving gold and platina.

Rationale. ..The muriatic acid attracts part of the oxigen oftlie nitric acid, thus converted partly into nitrous acid, and part-ly into nitrous gas, whilst the simple muriatic acid becomes con-verted, by tbis addition of oxigen, into oxigenated muriatic acid,or nitro-muriatic acid.

Remark. ..The same acid combination may be produced bymingling together oxigenated muriatic acid and nitrous gas.

From what has been said before, it is obvious that the saltsformerly called niteo-muriates' cannot exist,