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Test for Cations (QA)
This document describes cation tests for several metal ions, where sodium hydroxide or ammonium hydroxide are added to solutions of the metal ions. It provides information on the color of any precipitate formed and its solubility in excess reagent. Cation tests are described for iron (II), iron (III), copper (II), zinc (II), aluminum (III)/lead(II), calcium (II), and ammonium ions.
Test for Cations (QA)
- 1. Test for Cations by4e3 (Class of 2014)
- 2. Cation test –Fe2+ solution Add NaOH or aq. NH3 green ppt insoluble in excess Thanks Yang Jon! 4e3 (Class of 2014)
- 3. Cation test –Fe3+ solution Add NaOH or aq. NH3 Reddish-brown ppt insoluble in excess Thanks Sangeetha! 4e3 (Class of 2014)
- 4. Cation test –Cu2+ solution Add NaOH or aq. NH3 blue ppt NaOH: insoluble in excess aq. NH3: soluble in excess; deep blue solution Thanks Melinda! 4e3 (Class of 2014)
- 5. Thanks Zong Han!4e3 (Class of 2014) Cation test – Zn2+ solution Add NaOH or aq. NH3 white ppt soluble in excess; colourless solution
- 6. Thanks Busyra! 4e3(Class of 2014) Cation test – Al3+ or Pb2+ solution Add NaOH or aq. NH3 white ppt NaOH: soluble in excess; colourless solution aq. NH3: insoluble in excess
- 7. Thanks Crystal! 4e3(Class of 2014) Cation test – Ca2+ solution Add NaOH white ppt insoluble in excess no ppt with aq. NH3
- 8. Thanks Wei Qing!4e3 (Class of 2014) Cation test – NH4 + solution Add NaOH no ppt damp red litmus turn blue warm