The salts of basic tellurium are colourless and are easily hydrolysed in dilute aqueous solution with formation of the dioxide. 10 cm ) and slightly higher mobility (14 vs. The lower resistivities obtained in the first study were mirrored by higher carrier concentration (2 X 10 cm vs. While the deposition conditions appeared to be almost identical in all cases ( other than the silicotungstic acid added in some cases in the latter two studies), there were some unexplained differences in structural and electrical properties (the latter shown in the table). 3-5, potassium antimonyl tartrate was used as a source of Sb. Swirl gently until dissolved, and then dilute to 100 mL and swirl to make homogeneous. In a 250-mL Erlenmeyer flask, dissolve 0.45 g of potassium antimonyl tartrate in about 50 mL of distilled water. All glassware should be washed in phosphate-free detergent prior to use to avoid phosphate contamination. Note In this experiment, the phosphorus in water samples is determined by visible spectrometry following a reaction of the phosphates in the sample with potassium antimonyl tartrate, ammonium molybdate, and ascorbic acid. The intensity of the color which develops is linearly proportional to the. Other mild reducing agents have also been used, including tin(II) chloride, or hydrazine sulfate, which give maximum absorbances at slightly different wavelengths. This ammonium phosphomolybdate complex is yellow, but if mildly reduced by ascorbic acid in the presence of potassium antimonyl tartrate a solution of stable bluish- purple color ( molybdenum blue ) develops after about ten minutes, which has its strongest absorption at 882 pm (Fig. Dilute 25.0 mL of this solution to 250 mL with 1M hydrochloric acid which is 0.05 M in potassium bromide. Dissolve 1.625 g of the solid in 1 L of distilled water. 0.005 M Potassium antimonyl tartrate solution. The product can be recrystallised from hot water, but this is usually not necessary. Potassium antimonyl tartrate separates as colourless crystals. Pour the clear filtrate into a beaker and allow to cool. Then filter hot, using a Buchner funnel and flask which have been preheated by the filtration of some boiling distilled water. of water contained in a small flask, and boil the mixture under a reflux water-condenser for 15 minutes. of antimony trioxide (each being finely powdered) to 30 ml. The latter is prepared by boiling a solution of potassium hydrogen tartrate (or cream of tartar ) with antimony trioxide. 525), sodium ammonium tartrate, C4H OaNaNH4, used by Pasteur for his early optical resolution experiments, and potassium antimonyl tartrate (or Tartar Emetic), C4H404K(Sb0). ![]() Examples of the latter are sodium potassium tartrate (or Rochelle salt), C4H40 NaK, used for the preparation of Fehling s solution (p. Tartaric acid is noteworthy for a) the excellent way in which the majority of its salts Crystallise, and h) the frequent occurrence of salts having mixed cations. Potassium Antimonyl Tartrate (Tartar Emetic).
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