Chem lab unknown analysis 1

Chem lab unknown analysis 1 - Unknown Analysis Possible...

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Unknown Analysis Possible Ions - Cations: Na + , K + , NH 4 + - Anions: Cl - , OH - , SO 4 2- , HSO 4 - , NO 3 - Before Starting Unknown - Clean all glassware, crucible, spatula, etc before each use - Prepare the neutral water o Add a counted number of drops of deionized water to a clean vial o Add 1-2 drops of HBtB, color should be yellow due to slight acidity o Add a counted number of drops of tap water until color changes to green, indicating pH 7.0 - Get some litmus paper, matches, pH paper, indicators, reagents for use in unknown analysis o 6M HAc o Sodium cobaltinitrite reagent [Na 3 CO(NO 2 ) 6 ] o Red litmus paper o Matches o 0.02M AgNO 3 o 1M HNO 3 o 16M HNO 3 o 0.25M Ba(NO 3 ) 2 o 18M H 2 SO 4 o Single crystal of Fe(OH 2 ) 6 (NH 4 ) 2 (SO 4 ) 2 - Make sure to dilute a part of the unknown with neutral water pH Test - Dissolve a small portion of unknown sample into neutral water - Using pH indicators or pH paper, test the pH of each unknown solution - Acidic: NH 4 + , HSO 4 - - Neutral: Na + , K + , Cl - , SO 4 2- , NO 3 - - Basic: OH - A – B –
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Chem lab unknown analysis 1 - Unknown Analysis Possible...

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