CHM235 LAB NOTES EXPERIMENT # 2-2

CHM235 LAB NOTES EXPERIMENT # 2-2 - CHM235 Exp. # 2...

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CHM235 Exp. # 2 Supplementary Notes Ref: Exp. # 2 Solubility (Pavia et al, 3/e) Major goal: to learn how to predict whether or not a substance will be soluble in a given solvent. Guidelines Case 1: When solvent and solute are molecular, molecules of similar (“like”) polarity will be mutually soluble Hydrocarbon or halocarbon: nonpolar If contains O or N: polar, with highest polarity associated with hydrogen bond formers (must have H-O, H-N or H-F bonds) Even when polar functional groups are present, increasing size of the hydrocarbon portion quickly decreases overall polarity of molecule See increasing polarity diagram (p. 52) – substances close to one another in the chart are more likely to be mutually soluble Case 2: When solute ionizes and dissociates, solubility in polar solvents increases dramatically Happens commonly with acid/base reactions Organic acid + bases to form soluble acid salts Amines + acids to form soluble ammonium salts CAUTIONARY NOTE: Potential toxicity of many of the substances being used Observe carefully & use larger style microspatula to facilitate solubility
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This note was uploaded on 09/08/2010 for the course CHEMISTRY 235 taught by Professor Wikrent,pollyanna during the Spring '09 term at Pima CC.

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CHM235 LAB NOTES EXPERIMENT # 2-2 - CHM235 Exp. # 2...

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