Lecture Notes On Qualitative Analysis

Cover Lecture Notes On Qualitative Analysis
Lecture Notes On Qualitative Analysis
Henry Barker Hill
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Mn 8 O 4 H s, brown, Ni 2 O 6 H 6, black, CoO 6 H 6, black, and Fe 2 O 6 H 6, red brown, are insoluble in water or H 4 NCl+Aq, but soluble in acids. Sulphides. Insoluble in water or in solutions of the hydrates or sulphides of Gr. I. When moist they are oxi- dized upon exposure to the air, some of them, at least, turning into soluble sulphates. FeS, black, MnS, flesh col- ored, soluble in dilute acids ; ZnS, . White, soluble_in dilute mineral acids, insoluble in HC 2 H 3 O 2 ; NiS, black, CoS, ...black, insoluble in cold dilute acid, soluble in strong hot HCl+Aq or HNO 3 . The sulphides are not precipitated by H 3 S from acid, or, at best, partially from neutral solu- tions, except ZnS, which is precipitated from solution in HC 2 H 3 O 2 . Fe 2 S 3 cannot be formed in the wet way. From solutions of Fe 2 salts (H 4 N) 2 S-|-Aq precipitates FeS with separation of S. 1 In acid solutions H 2 S converts Fe 2 salts into Fe. 2 (H 4 N) 2 S-f Aq precipitates the other members as hydrated sulphides.

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