The Chemical News and Journal of Industrial Science, Tom 1221921 |
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Strona 28
... precipitate being washed repeatedly by decanta- tion with cold water and finally with hot water , until the filtrate gave no colour with phenol- phthalein . The washing must be very thorough , since the gelatinous hydroxide adsorbs the ...
... precipitate being washed repeatedly by decanta- tion with cold water and finally with hot water , until the filtrate gave no colour with phenol- phthalein . The washing must be very thorough , since the gelatinous hydroxide adsorbs the ...
Strona 30
... precipitate . The difficulties of precipitation are well known . Calcium fluoride is an extremely finely divided , slimy precipitate , which passes through nearly all filters the first time . Refiltering through the same filter proved ...
... precipitate . The difficulties of precipitation are well known . Calcium fluoride is an extremely finely divided , slimy precipitate , which passes through nearly all filters the first time . Refiltering through the same filter proved ...
Strona 35
... precipitate containing all the nitrogen of the cyanamide . ( 2 ) An aqueous solution of dicyanamide does not pre- cipitate with nitrate of silver in presence of NH3 , but gives a precipitate when the ammoniacal solu- tion is boiled with ...
... precipitate containing all the nitrogen of the cyanamide . ( 2 ) An aqueous solution of dicyanamide does not pre- cipitate with nitrate of silver in presence of NH3 , but gives a precipitate when the ammoniacal solu- tion is boiled with ...
Strona 43
... precipitate was obtained which was extracted with alcohol and treated with sodium carbonate . The product thus obtained was free from titanium and contained no diazo imide . It was insoluble in cold water , decomposed by hot water , and ...
... precipitate was obtained which was extracted with alcohol and treated with sodium carbonate . The product thus obtained was free from titanium and contained no diazo imide . It was insoluble in cold water , decomposed by hot water , and ...
Strona 44
... precipitate , and washing it with hot water . The dried hydroxide was ignited and the oxide decomposed with concentrated sulphuric acid . This acid solution was then evaporated to dryness and the anhydrous cobalt sulphate weighed ...
... precipitate , and washing it with hot water . The dried hydroxide was ignited and the oxide decomposed with concentrated sulphuric acid . This acid solution was then evaporated to dryness and the anhydrous cobalt sulphate weighed ...
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