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

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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 ü Question 1, version 1 Col 1: NR Ø CO 3 , I - not present Col 2: wh pcpt Ø could be HPO 4 or SO 4 Col 3: NR (pcpt does not dissolves) Ø must be SO 4 ; Col 4: wh pcpt Ø could be Cl - , CO 3 , HPO 4 Col 5: NR (pcpt does not dissolves) Ø must be Cl - Col 6: yellow Ø 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 -- Ø BaSO 4 H s L A + Ba H NO 3 L 2 + HNO 3 Ø NR A + AgNO 3 Ø Ag + + Cl - Ø AgCl H s L A + AgNO 3 + HNO 3 Ø NR Thymol Blue: yellow (acid)
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NaI + Na 2 CO 3 plus HNO 3 :yellowsoln, gas BaNO 3 :whitepcpt BaNO 3 + HNO 3
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