Scheme - water-Add a drop of 6M HAc and 2 or 3 drops of...

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Flame Test: K + ,NH 4 + ,Na + Ph Test:HO - ,HOSO 3 - and NH 4 + -PH can be estimated by indicators. - HO - is strong base (high ph). - HOSO 3 - is strong acid (low ph). - NH 4 + is weak acid (ph<7.0). NH4+ Test: -Add NaOH solution to a solution of the unknown. -Mix the solution well in a test tube. -Place a litmus paper in the mouth of the test tube and moistened it with DI water. -If litmus paper turns blue NH 3 is present. Therefore, NH 4 + must be present. K+ Crucible Test: -Place the unknown solid in a crucible and heat it until the fumes and smoke are no longer discharged. -If the unknown contains NH 4 + , it should be completely volatilized. -When the crucible is cooled off, dissolve any residue with 1-2 ml deionized
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Unformatted text preview: water.-Add a drop of 6M HAc and 2 or 3 drops of sodium cobaltinitrate reagent.-If it is precipitated, K + must be present. • Anions Tests: 1) Cl- Test: Add silver nitrate to a solution of the unknown then dilute it with HONO 2.-White precipitation should be observed. 2) SO 4 2- Test: Add couple of drops of 0.25M Ba(NO 3 ) 2 to the solution then dilute with HONO 2.-White precipitation should be observed. 3) NO 3- Test: Place a single small crystal of Fe(OH 2 ) 6 (NH 4 ) 2 (SO 4 ) 2 in a spot plate.-Cover the crystal with test solution - immediately add 2 drops of 18M H 2 SO 4 -Watch for brown solution around the crystal....
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