Chemical News and Journal of Industrial Science, Tomy 101-102Chemical news office., 1910 |
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Strona 3
... added the niobic acid used was free from tantalic , sulphuric , and silicic acids . To test for tantalic acid , some granules of the niobic acid were dissolved by warming with hydrofluoric acid and neutralised with potash solution ...
... added the niobic acid used was free from tantalic , sulphuric , and silicic acids . To test for tantalic acid , some granules of the niobic acid were dissolved by warming with hydrofluoric acid and neutralised with potash solution ...
Strona 4
... added when the production of a red or yellow coloration shows the presence of the element . The solubility of precipitated titanic acid in sulphuric acid is , as we have found , much greater if perhydrol is added at the same time ; the ...
... added when the production of a red or yellow coloration shows the presence of the element . The solubility of precipitated titanic acid in sulphuric acid is , as we have found , much greater if perhydrol is added at the same time ; the ...
Strona 5
... added depends upon the appearance of the precipitate ; as soon as it cakes together and becomes flocculent no more of the reagent need be added , for the precipitation is quantitative . If the addition of sulphurous acid is stopped ...
... added depends upon the appearance of the precipitate ; as soon as it cakes together and becomes flocculent no more of the reagent need be added , for the precipitation is quantitative . If the addition of sulphurous acid is stopped ...
Strona 6
... added , and then 3 to 5 cc . of hydrofluoric acid . The dish is covered with a watch crystal , and is evaporated by boiling to a volume of less than 10 cc . , or to about 5 cc . , requiring about ten minutes . Thirty cc . of hot water ...
... added , and then 3 to 5 cc . of hydrofluoric acid . The dish is covered with a watch crystal , and is evaporated by boiling to a volume of less than 10 cc . , or to about 5 cc . , requiring about ten minutes . Thirty cc . of hot water ...
Strona 7
... added , the solution boiled and filtered , and the precipitate washed with hot water . The precipitate is re - dissolved in the smallest possible amount of sulphuric acid , and re - precipitated with an excess of sodium carbonate in ...
... added , the solution boiled and filtered , and the precipitate washed with hot water . The precipitate is re - dissolved in the smallest possible amount of sulphuric acid , and re - precipitated with an excess of sodium carbonate in ...
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