By I. P. Alimarin and M. N. Petrikova (Auth.)

ISBN-10: 0080138128

ISBN-13: 9780080138121

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17). Stop lowering as soon as a somewhat blurred image of the pipette appears in the microscope: do not allow the pipette to touch the bottom of the capillary. By turning the screw of the piston with the left hand, force the solution from the pipette into the capillary, simultaneously using the right hand to control the manipulator so that the tip remains just immersed in the solution. Fill the capillary till a convex meniscus of solution appears over the capillary channel; there should be no air bubbles left in the capillary.

19). Thanks to its bright colour and large volume the precipitate is very easily seen in incident light. It is easily reprecipitated by dissolving in FIG. 19. Nickel dimethylglyoxime precipitate in a microcone. nitric acid, evaporating and then adding dimethylglyoxime and ammonium hydroxide. The Precipitation of Hydrous Iron (III) Oxide by Gaseous Ammonia Prepare a solution of an iron salt I 10 —j Fe j . Calculate the volume of solution needed to produce 100 my of hydrous iron (III) oxide. Place two vessels, a measuring capillary and a cone in the moist chamber.

The data obtained in this way are given in Tables 6 and 7. The Detection of Cobalt in the Form of Thiocyanate Prepare a solution of cobalt chloride I 0· 1 —^ Co I and a 50 per cent solution of ammonium thiocyanate. Chemically pure acetone is also required. In the holder in the moist chamber place two microvessels and one microcone about 1-5 mm in diameter, and also one micro vessel about 0-5 mm in diameter. Place the coloriscopic capillary on the cover slip on the chamber lid in the special round chamber.

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Inorganic Ultramicroanalysis by I. P. Alimarin and M. N. Petrikova (Auth.)


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