a2Sum06 - - 1 NAME_ _ I<_Er~ _ June 8, 2006 ~,/. Chern...

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- 1 - NAME __ __ I<_E r~ ~ ) . . ,/. Chern 322aL Summer 2006 June 8, 2006 LAB QUIZ #2 (Five pages - 40 points) 1. (4) Circle the correct word or phrase in each set separated by / to make the following statement true; note the phase diagram sketched on the board. As a solid compound's purity goes from 85% to 90% to 95%, its visible melting range increases / EcreaBy The sample's melting point typi- ~/ cally I decreases a lot I ~ittl~ (,,\~ 2. (3) A certain sample, X, of "mp" = 88 ° - 93 0, is believed to be 280\ cpd M or 280\ cpd N, but might contain neither M nor N. 95\ pure authentic M melts 100° - 102°; 98% pure authentic compound N melts 97° - 98°. A mixture of X and M has mp = 82° - 83°; a mixture of X and N melts 92° - 94°. Give the most likely interpretation of these data with regard to the compo- sition of X; state your reasoning concisely. , -K N. x ) /
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I. - 2 - fJ1 £, =- to 3. (5) A certain solid sample comprises 10.0 9 A and 16.0 9 B. Their solubilities in a solvent S are independent. Each dissolves to the extent of 10 g/100 g S when hot. in ~ S, A's solu- bility is 1.0 9 per 100 g S; B's solubility is 4.0 g/100 9 S. (a) (3) Calculate the minimum amount of solvent from which one should recrystallize the sample to obtain pure A. Remember that one should use enough solvent to dissolve the whole sample hot and
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This note was uploaded on 05/05/2008 for the course CHEM 322AL taught by Professor Jung during the Summer '07 term at USC.

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a2Sum06 - - 1 NAME_ _ I&lt;_Er~ _ June 8, 2006 ~,/. Chern...

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