Industrial Chemistry a Manual for Use in Technical Colleges Or Schools And for
Industrial Chemistry a Manual for Use in Technical Colleges Or Schools And for
M Anselme Payen
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At a higher temperature, it is decomposed as follows: 2FeS0 4 = Fe 2 3 + S0 2 +S0 3 ; but this reaction generally takes place in the presence of a little water, so that the distillate consists of a thick oily liquid, known as ' Nordhausen acid. ' This name was derived from Nordhausen, at which place the sulphuric acid of commerce was made by the same method, long before the present mode of manufacture was introduced. The ferric oxide which remains after the distillation is sold under the name o...f colcothar, rouge or crocus of Mars, and is largely used for glass polishing and as a pigment. Ferrous sulphate forms double combinations with the sulphates of the alkali metals, the potassium compound being FeS0 4 K 2 S0 4 6H 2 0, and has the power of absorbing nitric oxide in common with other ferrous salts. Preparation. For preparing pure ferrous sulphate, iron is dissolved in dilute sulphuric acid, an excess of iron being necessary to prevent oxidation ; the solution is then filtered quickly, rendered slightly acid by the addition of sulphuric acid, and evaporated to crystallisation.
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