The Chemistry of Germanium
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) Spectroscopic Tests and Solubility. No. 1 gave on testing with the spectroscope only potassium and germanium. No. 2 gave by the same test potassium, germanium, and a possibility of a trace of calcium. As the carbons used in forming the arc con- tained small amounts of iron, sodium and calcium, the test was not conclusive for these elements. The calcium lines appeared to be enhanced by the presence of fluorine rendering the test for that element still more uncertain.
Both samples were soluble ...in 40 parts of boiling water having no detectable trace of solid. The solution appeared perfectly clear thus excluding more than a trace of calcium fluoride.
Test for Arsenic. Twenty-five hundredths of a gram of Sample No. 2 was dissolved in 30 cc. Of boiling water. Sodium carbonate solution was added until the solution was alkaline to litmus paper. Seven and one-half cc. Of calcium chloride solution (1:10) was added. This caused the litmus paper to turn red. The precipitation of calcium fluoride causes a strong acid reaction, perhaps, accord- ing to the equation : K 2 GeF (i -f3CaCl, -f4H 2 O=3CaF 2 -f2KCl+4HCl-hH 4 GeO 4 Sodium carbonate was added to a faint alkaline reaction.
What to read after The Chemistry of Germanium?
You can find similar books in the "Read Also" column, or choose other free books by Frank William Douglas to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
) Spectroscopic Tests and Solubility. No. 1 gave on testing with the spectroscope only potassium and germanium. No. 2 gave by the same test potassium, germanium, and a possibility of a trace of calcium. As the carbons used in forming the arc con- tained small amounts of iron, sodium and calcium, the test was not conclusive for these elements. The calcium lines appeared to be enhanced by the presence of fluorine rendering the test for that element still more uncertain.
Both samples were soluble ...in 40 parts of boiling water having no detectable trace of solid. The solution appeared perfectly clear thus excluding more than a trace of calcium fluoride.
Test for Arsenic. Twenty-five hundredths of a gram of Sample No. 2 was dissolved in 30 cc. Of boiling water. Sodium carbonate solution was added until the solution was alkaline to litmus paper. Seven and one-half cc. Of calcium chloride solution (1:10) was added. This caused the litmus paper to turn red. The precipitation of calcium fluoride causes a strong acid reaction, perhaps, accord- ing to the equation : K 2 GeF (i -f3CaCl, -f4H 2 O=3CaF 2 -f2KCl+4HCl-hH 4 GeO 4 Sodium carbonate was added to a faint alkaline reaction.
What to read after The Chemistry of Germanium?
You can find similar books in the "Read Also" column, or choose other free books by Frank William Douglas to read onlineMoreLess
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