192 
ME. G. GOEE ON HYDEOELTJ OEIO ACID. 
iodides of arsenic and antimony, the tetraiodide of platinum, iodide of silver, biniodide of 
mercury, subiodide of copper, and the iodides of lead, cadmium, and zinc were unaffected, 
whilst the iodides of calcium, barium, sodium, and potassium were strongly decomposed, 
and iodine freely liberated in the first three instances. Iodate of potassium also exhi- 
bited some. chemical action, but no iodine was set free. The acid decomposes all carbo- 
nates ; the anhydrous carbonates of silver, copper, cobalt, lead, cadmium, zinc, manganese, 
calcium, strontium, barium, lithium, sodium, potassium, and ammonium were all decom- 
posed with effervescence ; those of the alkali and alkaline-earth metals exhibited violent 
action. Fused borax and the borate of ammonium produced powerful chemical action. 
The boro-fluorides of sodium and potassium were unaffected. Glass was rapidly corroded. 
(N.B. It was not corroded in the gaseous acid: see page 184.) The silico-fluorides of 
sodium and potassium dissolved with effervescence ; titano-fluoride of potassium also dis- 
solved with strong action. Carbonic bisulphide would not mix with the acid ; the acid had 
also no chemical or solvent effect upon the sulphides of arsenic (both), antimony (the black 
sulphide), palladium, mercury (vermilion), copper (sub sulphide), iron (both), lead, tin (the 
bisulphide), cadmium, zinc, and molybdenum ; the sulphides of calcium, barium, sodium, 
and potassium were violently decomposed with evolution of sulphuretted hydrogen, and 
in the latter instance with separation of liquid sulphur. Bisulphite of sodium dissolved 
with effervescence. Sulphate of cobalt was unaffected ; the sulphates of calcium, stron- 
tium, and barium partly dissolved with a hissing sound; sulphate of sodium and acid sul- 
phate of potassium exhibited strong action and dissolved. Chrome-alum dissolved quietly 
to a purple liquid, and sulphate of ammonium to a colourless liquid. Phosphide of copper 
was unaffected ; phosphide of calcium was powerfully decomposed ; phosphate of copper 
was also decomposed ; phosphate of uranium produced action ; phosphate of calcium 
was partly dissolved, and phosphate of ammonium completely. Arsenite of copper was 
decomposed ; arsenite and arseniate of ammonium, and the arseniate of magnesium and 
ammonium, produced violent action ; the first and third were dissolved. Damp crystals of 
permanganate of potassium hissed and dissolved to a deep-green liquid. Bed chromate of 
lead became yellow and partly dissolved ; yellow chromate of lead dissolved to a yellow 
liquid ; the mono-chromates of sodium and potassium, and the acid chromates of sodium, 
potassium, and ammonium dissolved with violent action to blood-red liquids, with evolu- 
tion of vapour of fluoride of chromium ; vanadate and metavanadate of ammonium pro- 
duced powerful action, the former partly, and the latter wholly dissolving to yellow liquids. 
Native molybdate of lead was unaffected ; molybdate of ammonium produced strong 
action but did not dissolve. The tungstates of sodium and ammonium were violently 
decomposed, the former dissolved, and the latter remained insoluble. Cyanide of mer- 
cury was partly dissolved ; cyanide of potassium was violently decomposed with libera- 
tion of hydrocyanic acid ; anhydrous ferrocyanide of potassium dissolved with violent 
action, and the solution became milky on addition of water ; ferricyanide of potassium 
dissolved to a yellow liquid, and nitrocyanide of titanium was unaffected. 
The acid mixed with pyroxylic spirit with strong action, and with ether and alcohol. 
