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indc2007 - T IlE UNIVERSITY OF NEW SOUTH WALES NOVEMBER...

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TIlE UNIVERSITY OF NEW SOUTH WALES NOVEMBER, 2007 INDC2003 Industrial Chemistry Laboratory I TIME ALLOWED: 3 hours TOTAL NUMBER OF QUESTIONS: 12 ALL QUESTIONS ARE OF EQUAL VALUE. ANSWER QUESTIONS 1-6 IN A SEPARATE BOOK. ANSWER QUESTIONS 7-10 IN A SEPARATE BOOK. ANSWER QUESTION 11 IN A SEPARATE BOOK. ANSWER QUESTION 12 IN A SEPARA TB BOOK. THIS PAPER MAYBE RETAINED BY THE CANDIDA TB. ALL ANSWERS MUST BE WRITTEN IN INK. EXCEPT WHERE THEY ARE EXPRESSLY REQUIRED, PENCILS MAYBE USED ONLY FOR DRAWING, SKETCHING AND GRAPHICAL WORK. 1
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Question 1 (a) Briefly describe three ways to detect systematic error in an analysis. (b) Explain how Solid-Phase Extraction (SPE) works in sample preparation. Question 2 (a) Briefly describe the relationship between absorbance and transmittance. Identify three factors that cause the Beer's law relationship to fail. (b) Briefly describe three types of instrumental error which are sources of uncertainty in transmittance measurement. Question 3 (a) Band broadening is a common phenomenon in chromatography. Outline three factors that may lead to band broadening, using the Van Deemter equation.
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