A Systematic Qualitative Chemical Analysis a Theoretical And Practical Study of
The book A Systematic Qualitative Chemical Analysis a Theoretical And Practical Study of was written by author George Wallace Sears Here you can read free online of A Systematic Qualitative Chemical Analysis a Theoretical And Practical Study of book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is A Systematic Qualitative Chemical Analysis a Theoretical And Practical Study of a good or bad book?
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Of magnesia mixture (MgCl 2 -NH 4 Cl-NH 4 OH). Shake the contents vigor- ously and if no precipitate forms rub the walls of the tube with a glass rod and allow it to stand for some time. (See note, Preliminary Exp. I4a). The formation of a white crystalline precipitate indicates the presence of arsenic. Filter and confirm the arsenic by (42). (42) Confirmatory Test for Arsenic. Dissolve the precipitate of MgNH 4 AsO 4 (41) by pouring 5-10 cc. Of 6N. HC1 repeatedly through the filter. Heat the s...olu- tion to boiling and pass H 2 S into it for five to ten minutes. The formation of a white precipitate, changing to yellow, shows the presence of arsenic. (See Discussion 17. ) (43) Detection of Antimony. To the filtrate (40) add water just sufficient to make a total volume of 50 cc. ; transfer to a small flask and heat to about 90. Pass H 2 S into the hot solution for about five minutes, keeping the temperature at about 90 by placing the flask in a beaker containing boiling water. The formation of an orange-red precipitate shows the presence of antimony.
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