The pentammine purpureo-salts are formed from the luteo-salts by loss of ammonia, or from an air slowly oxidized ammoniacal cobalt salt solution, the precipitated luteosalt being filtered off and the filtrate boiled with concentrated acids. [Please select]
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Filter through blotting paper, and to the clear filtrate add some phosphate of soda solution. [Please select]
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Evaporate the filtrate to dryness in a platinum dish. [Please select]
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Return the filtrate and washings to the dish, evaporate the water, and carefully ignite without fusion. [Please select]
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, and return the filtrate if not clear and bright. [Please select]
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(4) It is sometimes advisable to add a little potassium sulphate to insure a clear filtrate. [Please select]
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