Exam_1_KEY_Chem1230 F2007

Exam_1_KEY_Chem1230 F2007 - Chem 1230 Exam 1 Oct. 2, 2007...

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Unformatted text preview: Chem 1230 Exam 1 Oct. 2, 2007 1. Safety Experiment 1A (Qual Analysis): Nitric acid and ammonia are an acid and a base and can cause chemical burns. If you spill either, notify your TA. Barium is a heavy metal and is toxic. Be sure to wash your hands after using barium solutions. Experiment 1B (Chromatography): The solvent used for the mobile phase is flammable. No flames are allowed during the lab. Hydrochloric acid can cause chemical burns. If you spill it, notify your TA. The reaction of sodium sulfide with water produces a toxic gas. Be sure to use the sodium sulfide spray under a fume hood. Experiment 1C (Density measurements): Never use your mouth to pipet || use a bulb. Experiment 2 (Mass Spec): Nothing special; obey general rules 2. Qual Analysis Question 1, version 1 Col 1: NR CO 3 , I- not present Col 2: wh pcpt could be HPO 4 or SO 4 Col 3: NR (pcpt does not dissolves) must be SO 4 ; Col 4: wh pcpt could be Cl- , CO 3 , HPO 4 Col 5: NR (pcpt does not dissolves) must be Cl- Col 6: yellow acidic; consistent with SO 4 and Cl- Everything has been eliminated except SO 4 and Cl- , so that's what it is. A + HNO 3 : NR A + Ba H NO 3 L 2 : Ba ++ + SO 4-- BaSO 4 H s L A + Ba H NO 3 L 2 + HNO 3 NR A + AgNO 3 Ag + + Cl- AgCl H s L A + AgNO 3 + HNO 3 NR Thymol Blue: yellow (acid) NaI + Na 2 CO 3 plus HNO 3 : yellow soln, gas BaNO 3 : white pcpt BaNO 3 + HNO 3 : pcpt dissolves, gas AgNO 3 : pale yellow pcpt AgNO 3 + HNO 3 : pcpt partly dissolves, gas ThymolBlue: green H neutral L Null Question 1 version 2 Col 1: yellow I- is present Col 2: wh pcpt could be CO 3 , HPO 4 , or SO 4 Col 3: dissolves...
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This note was uploaded on 04/02/2008 for the course CHM 1230 taught by Professor Mcclain during the Fall '07 term at Wayne State University.

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Exam_1_KEY_Chem1230 F2007 - Chem 1230 Exam 1 Oct. 2, 2007...

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