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a2Sum06

# a2Sum06 - 1 NAME I<_Er~ June 8 2006 ~ Chern 322aL Summer...

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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.
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a2Sum06 - 1 NAME I<_Er~ June 8 2006 ~ Chern 322aL Summer...

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