FOOTNOTES:
[78] MnO2 + 4HCl = MnCl2 + Cl2 + 2H2O.
[79] Provided a sufficiency of ammonic chloride is present.
[80] With some silicates, &c., a preliminary fusion with sodium carbonate will be necessary.
[81] Instead of sodium acetate, ammonium succinate can be used.
[82] Journ. Soc. Chem. Industry, vol. x. p. 333.
[83] MnO2 + 2FeSO4 + 2H2SO4 = Fe2(SO4)3 + MnSO4 + 2H2O.
[84] If the ore is very rich, a smaller quantity (0.75 or 1.5 gram) must be taken; otherwise the iron will be insufficient.
[85]
MnO2 + 4HCl = MnCl2 + 2H2O + Cl2.
Cl2 + 2KI = 2KCl + I2.
[86] Iodine probably lost by volatilisation.
[87] Obtained as a brown powder by digesting red lead with nitric acid and filtering.
[88] The water for dilution and the dilute sulphuric acid used for washing should be previously tested, to see they have no reducing action, with dilute permanganate of potassium solution.
[89] Arnold and Hardy, Chemical News, vol. lvii. p. 153.