Organic 2 Review Problem 480

Organic 2 Review Problem 480 - 464 PRACTICAL ORGANIC...

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Unformatted text preview: 464 PRACTICAL ORGANIC CHEMISTRY thf subsequent titration with standard sodium hydroxide, using phenolphthaleiri as an indicator. Place about 50 ml. of 40% "formalin solution" in a conical flask and add at least io drops of phenolphthalein solution. Now add very care- fully from a burette dilute sodium hydroxide solution (Al 1 io will serve the purpose) until the solution is just faintly pink. Weigh out accurately about 2 g. of glycine, transfer to a 250 ml. graduated flask, dissolve in distilled water, make up to the mark, and mix well. Transfer 25 ml. of the solution to a conical flask, add 2 drops of phenolphthalein, and then again add dilute sodium hydroxide very carefully until the solution is just faintly pink. Now add about io ml. (i.e., an excess) of the neutralised formaldehyde solution: the pink colour of the phenolphthalein disappears immediately and the solution becomes markedly acid. Titrate with M]IO sodium hydroxide solution until the pink colour is just restored. Repeat the process with at leastuntil the pink colour is just restored....
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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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