Chm2046L Scheme 1 Unknowns

Chm2046L Scheme 1 Unknowns - Katherine Scheppegrell CHM...

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Flame Test Purple K + Flame Test Orange = Na + pH < 3 HSO 4 pH >12 OH - present Cation : Na + , K + , NH 4 + Anions: Cl - , NO 3 - , SO 4 -2 , HSO 4 - , OH - Katherine Scheppegrell CHM 2046L Sect. 2/12/08 Scheme 1 for Unknowns Possible ions a) Cation : Na + , K + , NH 4 + b) Anions: Cl - , NO 3 - , SO 4 -2 , HSO 4 - , OH - c) Salt Formulas: KCl, NH 4 Cl or NaCl, etc., only if sure Procedure – for the unknown analysis a) Prepare the “neutral water”; if the pH of the deionized water is significantly different than 6-7. i. Add a counted number of drops of deionized water into a clean test tube. Treat with 1-2 drops of HBtB. It should be yellow. Add drops of tap water until the solution is green, indicating a pH of 7.0. The ratio will be neutral for pH testing. b) Clean spot plate, crucible, test tubes, vials, graduated cylinders, droppers, beakers, etc. c) Need: i. pH paper ii. matches iii. pH indicators iv. 1M MaOH v. 6M HAc vi. Sodium cobaltnitrite reagent [ Na 3 CO(NO 2 ) 6 ] vii. 1MHNO 3 viii. 0.02M AgNO 3
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ix. 0.25M Ba(NO
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Chm2046L Scheme 1 Unknowns - Katherine Scheppegrell CHM...

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