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AS Chemistry cation identification tests a visual guide

AS Chemistry cation identification tests a visual guide. Designed by Samuel Millar. KEY. suspected aqueous cation (colour indicated). precipitate. solution. smoke. reagent solution:. {. NaOH (aq) sodium hydroxide solution NH 3 (aq) ammonium hydroxide solution

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AS Chemistry cation identification tests a visual guide

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  1. AS Chemistrycation identification testsa visual guide Designed by Samuel Millar

  2. KEY suspected aqueous cation (colour indicated) precipitate solution smoke reagent solution: { NaOH (aq) sodium hydroxide solution NH3 (aq) ammonium hydroxide solution KSCN(aq) potassium thiocyanate solution K2CrO4(aq) potassium chromate solution

  3. NH3 (aq)(add dropwise) NaOH (aq) COPPER (II) Cu2+(aq) Cu2+(aq) pale blue ppt insoluble in excess pale blue ppt soluble in excess: deep blue soln(complex ion solution)

  4. NH3 (aq) or NaOH (aq) KSCN (aq) IRON (III) Fe3+(aq) Fe3+(aq) blood red soln (complex ion solution) rust-brown ppt insoluble in excess

  5. NH3 (aq) or NaOH (aq) IRON (II) Fe2+(aq) dirty green ppt insoluble in excess

  6. KCrO4 (aq) BARIUM (II) Ba2+(aq) yellow ppt soluble in hydrochloric acid: yellow soln

  7. NaOH(aq) AMMONIUM NH4+(aq) HEAT pungent colourless gas evolved reacts with hydrogen chloride vapour: white smoke

  8. ALUMINIUM (III), ZINC (II), MAGNESIUM (II)These cations all produce white precipitates with NaOH and NH3 solutions. The precipitates have the following solubilities in excess: Al3+(aq) Zn2+(aq) Mg2+(aq) NH3 (aq) soluble: colourless soln (complex ion soln) insoluble insoluble NaOH (aq) soluble: colourless soln (ppt amphoteric) soluble: colourless soln (ppt amphoteric) insoluble

  9. FLAME TESTS

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