Chemistry 360 - Athabasca University

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$Experimental Design - Math Site$

CHEM360 Report Book 2012-14Exp.137. Will your product be essentially pure after washing your product with ice cold 95% ethanol, ice cold95% ethanol + 4% acetic acid and again with ice cold 95% ethanol in Step 3 of the procedure?a) yesb) no8. Why must the washing solutions be ice-cold in Step 3 of the procedure?a) to prevent dissolving the product, which is more soluble in warm solvent than coldb) to keep the reaction from warming upc) to prevent unwanted side reactions9. How will you know which solvent (95% ethanol or toluene) is more suitable for the recrystallizationof your product?a) the chosen solvent will dissolve less crystals when hot, and form more crystals when coldb) the chosen solvent will dissolve more crystals when hot, and form more crystals when coldc) the chosen solvent will dissolve less crystals when hot, and form less crystals when coldProduct Characterization10. What reason(s) may help to explain a low percentage yield for your aldol condensation reactiona) the reagents where incorrectly measuredb) all the washing steps resulted in the loss of some product, even when ice cold solvents were usedc) the chosen recrystallization solvent still kept some of the product dissolvedd) all of the above37
CHEM360 Report Book 2012-14Exp.13CHEM360 Experiment 13 ReportStudent Name:___________________Date:___________ID Number:___________Title:Objective(s):Reaction Equation: (structures and names)Introduction:38
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Chemistry 360 - Athabasca University

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