Organic 2 Review Problem 524

Organic 2 Review Problem 524 - . . . . 25-00 ml. ,, ,,...

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5 o8 PRACTICAL ORGANIC CHEMISTRY however the bomb can be placed in a fume-cupboard, and a heavy iron plate or some loose bricks placed in front of the bomb, the gas supply being controlled from a protected position: safety goggles should also be worn. As a further precaution, the weight of material analysed may be reduced to ca. io mg., the lactose-nitrate mixture to 50 mg., and the sodium peroxide ro g., the silver nitrate and the ammonium thio- cyanate solutions being o-oiM.concentration. Example of Calculation Estimation of Cl in />-dichlorobenzene. Weight of sample taken . . . . . . . 0-0210 g. Volume o f o-oaA/.AgNO 3 solution added
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Unformatted text preview: . . . . 25-00 ml. ,, ,, o-o2M.NH 4 SCN „ required . . . 1070 ml. ,, „ 0-OzMAgNO 3 ,, required to precipitate the chlorine . . . 14*30 ml. 14-30 ml. o-ozM.Aj^NOg = 35*4-6 X 0-02 X 14*30 g. chlorine. .'.0-021 g. of substance contains ,, „ ,, „ /.TOO g. of substance contain 35-46 X 0-02 X 14-30 X ioo g. chlorine. 0-0210 = 48-28% Theoretical for C 6 H 4 Cl 2 , 48-30%. (Clearly it is not necessary to know the exact concentration of the ammonium thiocyanate solution, for it can be titrated against a known volume of the o-o2M.AgNO 3 solution, and this ratio used in the calculation.)...
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This note was uploaded on 09/19/2011 for the course CHM 2211 taught by Professor Castalleano during the Fall '06 term at University of Florida.

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