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ChemScheme9 - If insoluble separate and test separately...

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Cations: Na + , K + , NH 4 + , Ca 2+ , Mg 2+ , Al 3+ , Zn 2+ , Cu 2+ , Ag + Anions: Cl - , NO 3 - , SO 4 2- , HSO 4 - , OH - , CO 3 2- , HCO 3 - , O 2- , S 2- /HS - Flame Test: a. Yellow- Na + present b. Purple- K + present, no Na + c. Red- Ca + present, no K + or Na + d. Green- Cu 2+ present, no Na, K or Ca e. No color- No Na, K, Ca or Cu NH 4 + Test: Take portion of sample and add 6M NaOH. Do sniff/red litmus test. CO 3 2- Test: Add 6M HNO 3 to sample. If bubbles, CO 3 2+ present. Use pH to differentiate between CO 3 2- and HCO 3 - . S 2- Test: Treat sample with H 2 SO 4. If smell, S 2- /HS - present pH: 1. HSO 4 - (No Carbonate or OH - ) 3. Al(OH 2 ) 6 3+ (No Carbonate or OH - ) 5. NH 4 + or Mg 2+ 7. Cl - , NO 3 - , SO 4 2- , K + , Na + , Ca 2+ 8. HCO 3 - (No HSO 4 - , Al 3+ , OH - ) 12. CO 3 2- (No HSO 4 - , Al 3+ , NH 4 + ) 13. OH - present (No HSO 4 - , Al 3+ , NH 4 + , HCO 3 - ) Supernatant liquid pH: 7. CaSO 4 *2H 2 O 9.5 MgCO 3 10 CaCO 3 10.5 Mg(OH) 2 12.6 Ca(OH) 2
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9A: If soluble, perform soluble test only. If insoluble, discard supernatant liquid and do insoluble test.
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Unformatted text preview: If insoluble, separate and test separately. Insoluble Test: Black: CuO, CuS, Ag 2 O, Ag 2 S Blue: CuCO 3 Dark Green: Ag 2 CO 3 White: AgCl, Ag 2 SO 4 , Ca(OH) 2 , Mg(OH) 2 , CaCO 3 , CaSO 4 *2H 2 O Soluble Test: Anions: Cl-: Add 2-3 drops of 6M HNO 3 to sample solution until acidic (test with Blue litmus). Add a few drops of 0.02M AgNO 3 . If a precipitate forms, Cl-present. SO 4 2-: Add 2-3 drops of 6M HNO 3 to sample solution until acidic (test with Blue litmus). Add a few drops of 0.25M Ba(NO 3 ) 2 . If precipitate, SO 4 2-present. Use pH to differentiate. NO 3-: Place Ferrous Ammonium Sulfate crystal into spot plate. Cover with solution then 18M H 2 SO 4 . If crystal turns brown, NO 3-present....
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