Chemical News and Journal of Industrial Science, Tomy 105-106Chemical news office., 1912 |
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Strona 32
... treated with hydrogen sulphide . After separation from the lead sulphide the alcoholic solution was allowed to evaporate slowly , leaving a somewhat waxy mass of leaflets . This mass was purified by dis- solving again in alcohol and ...
... treated with hydrogen sulphide . After separation from the lead sulphide the alcoholic solution was allowed to evaporate slowly , leaving a somewhat waxy mass of leaflets . This mass was purified by dis- solving again in alcohol and ...
Strona 33
... treated with boiling 95 per cent alcohol , a portion of the humus pre- cipitate goes into solution . If the alcohol is removed by evaporation and water added to keep the volume constant , a dark coloured precipitate is formed , which ...
... treated with boiling 95 per cent alcohol , a portion of the humus pre- cipitate goes into solution . If the alcohol is removed by evaporation and water added to keep the volume constant , a dark coloured precipitate is formed , which ...
Strona 36
... treated , and in all about eighty - six experiments are described . Very full questions on the details of each experiment are given , and in addition there are sets of general questions , the answering of which will sometimes involve ...
... treated , and in all about eighty - six experiments are described . Very full questions on the details of each experiment are given , and in addition there are sets of general questions , the answering of which will sometimes involve ...
Strona 38
... treated with concentrated sulphuric acid , hydrochloric acid gas escapes , and the chloride is transformed into the corresponding sulphate . At one time this was explained as due to the greater strength of sulphuric acid , but we cannot ...
... treated with concentrated sulphuric acid , hydrochloric acid gas escapes , and the chloride is transformed into the corresponding sulphate . At one time this was explained as due to the greater strength of sulphuric acid , but we cannot ...
Strona 41
... treating it for several hours with 2 per cent sodium hydrate , the dark coloured extract syphoned off , and the humus ... treated with dilute sulphuric acid , avoiding excess . The lead sulphate was removed by filtration and the filtrate ...
... treating it for several hours with 2 per cent sodium hydrate , the dark coloured extract syphoned off , and the humus ... treated with dilute sulphuric acid , avoiding excess . The lead sulphate was removed by filtration and the filtrate ...
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