Preparation of Ammonium Hexafluocobaltate II

Preparation of Ammonium Hexafluocobaltate(II). Preparation of a Cobalt(II) Chloride Solution. Assemble an apparatus (see Fig. 116), replacing dropping funnel 2 with a gas-discharge tube. Put 

Preparation of Ammonium Hexafluocobaltate lI). Dissolve 1.5 g of ammonium fluoride in 100 ml of methanol. Why should methanol be taken Filter the solution. While stirring the ammonium fluoride solution, add to it a cobalt(II) chloride solution up to complete precipitation. Separate the product with the aid of a glass filter No. 2 (270 mesh) and wash it with ether (why is this washing necessary ). Dry the product in the air, weigh it, and calculate its yield in per cent. 

Preparation of Hexaamminenickel(II) Chloride. Dissolve 25 g of nickel nitrate in the smallest possible amount of water and add an amount of a 25% ammonia solution such that the initially formed precipitate would completely dissolve. If the initial salt was insuf- 

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II. Preparation of Ammonium Hexafluocobaltate(II) (248). 12. Preparation of Hexaaminenickel(II) Chloride (248). 13. Preparation of Nickel Carbonyl (249). 

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