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scheme of analysis 9 - Scheme of Analysis Assignment 9...

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Scheme of Analysis - Assignment 9 Possible Ions: Cations : Na + , K + , NH 4 + , Ca 2+ , Mg(OH 2 ) 6 2+ , Al(OH 2 ) 6 3+ , Cu(OH 2 ) 6 2+ , Zn(OH 2 ) 6 2+ , Ag(OH 2 ) 6 + Anions : Cl - , NO 3 - , SO 4 2- , HSO 4 - , OH - , CO 3 2- , HCO 3 - , HS - , S 2- Insoluble Compounds : Ca(OH 2 ) 2 , CaSO 4 ●2H 2 O, CaCO 3 , MgCO 3 , Mg(OH) 2 Alums : Na[Al(OH 2 ) 6 ](SO 4 ) 2 ●6H 2 O, K[Al(OH 2 ) 6 ](SO 4 ) 2 ●6H 2 O, NH 4 [Al(OH 2 ) 6 ] (SO 4 ) 2 ●H 2 O Sample A : Pure salt (one anion and one cation) or alum (1 cation and 1 anion OR KAl(SO 4 ) 2 , NH 4 (SO 4 ) 2 ) Sample B : Mixture of salts, pure salt, or alum. 1. Sample Description: Color Crystal Shape Odor Phase -Homogenize unknown if mixture 2. Prepare Solution: Dissolve about half the sample in 10mL of deionized water. 3. Flame Test: Heat nichrome wire loop. If the wire produces a color, dip the loop in 16M HONO 2 and rinse with deionized water to remove impurities. Yellow Flame: Na + present Purple: K + possibly present (Na + , Ca 2+ not present) Red: Ca 2+ possibly present (Na + not present) Bright Orane/Yellow: Na + Green: Cu(OH 2 ) 6 2+ No color: Na + , K + , Ca 2+ not present 4. pH Test Prepare neutral water: add HBtB to 1mL deionized water. If it is yellow, treat dropwise with tapwater until it turns green. Prepare about 10mL in this fashion. Prepare solutions of samples. Step 1: Test with Bromthymol Blue. Yellow, step 2. Blue, step 4.
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