Researches Chemical and Philosophical; Chiefly concerning nitrous oxide / or dephlogisticated nitrous air and its respiration

by Sir Humphry Davy

Annales De Chimie, xxviii. pag. 154.

[114] Nicholson’s Phil. Jour. No. 1, p. 453.

[115] I have been able to make these observations on the sulphates of iron, most of them after Proust.

[116] Annales de Chimie, vol. xxviii. pag. 182.

[117] [Division IV. Section 5.]

[118] [Division II. Section 1].

[119] No precipitation takes place during the conversion of solution of green sulphate into red; and the acid appears saturated.

[120] Division II, Section 6.

[121] According to the estimation in the equation, 6.5 of dry green sulphate of iron contain 4.1 green oxide of iron, and 2.4 of Kirwan’s real sulphuric acid; and 8.1 red sulphate of iron, contain 2.4 acid, and 5.7 red oxide of iron.

[122] The muddy green color produced in a solution of red sulphate of iron agitated in nitrous gas, depended upon impurities in the mercury. I have since found, that when the solution is completely oxygenated, the diminution is barely perceptible.