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UnknownScheme1 - February 6 2007 CHM 2046L Unknown Analysis...

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February 6, 2007 CHM 2046L Unknown Analysis 1 Possible ions 1 i. Cations: Na + , K + , NH 4 + 2 ii. Anions: Cl , NO 3 , SO 4 2− , HSO 4 , OH Procedures for the unknown analysis: i. Prepare the “neutral water” a. Adding a counted number of drops of deionized water to a clean test-tube. Treat with 1-2 drops of HBtB. Should be yellow. Add tap water, and count the number of basic tap water needed to produce a green color, indicating a pH of 7.0. The ratio of deionized water/tap water will give you “neutral water.” ii. Clean glassware and crucible, etc. iii. Get some indicators, reagents (using your plastic bottles) and litmus papers that you need use during the unknown analysis; iv. Get a unknown card from the stockroom and fill in the necessary information; v. Bring the card to the stockroom and get two unknown samples; vi. Return the unknown card to the personnel in the stockroom when you finish it! 1. Describe Sample : Phase, color, odor, crystal shape if crystalline, etc.
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