Determination of the Atomic Weight of Cadmium and the Preparation of Certain of Its Sub-Compounds

by Harry C. Jones

Third determination of water.

Amount	of	substance	used	.11766	gr.
”	”	water	found	.00856	”
Water.
7.25 per cent.

Average amount of water = 7.07 per cent.

The calculated percentage of water in Cd(OH) is, 6.99.

At the temperature at which concentrated sulphuric acid gives off dense white fumes cadmous hydroxide gives off all its water and passes over into a heavy yellow powder. At 150°C not a trace of water was liberated. Under the microscope the yellow powder was found to consist of minute translucent crystals.

First determination of cadmium.

Amount	of	substance	used	.08064	gr.
”	”	cadmium	found	.07511	”
Cadmium.
93.14 per cent.

Second determination of cadmium.

Amount	of	substance	used	.10846	gr.
”	”	cadmium	found	.10106	”
Cadmium.
93.17 per cent.

The calculated percentage of metal in Cd₂O is 93.32 per cent.