Precipitates

Precipitates

Sodium Hydroxide solution (NaOH)
1. Green ppt
  1. Turns brown
    1. Insoluble ppt
      1. Iron (II)
  2. Soluble in excess NaOH to form green solution
    1. Chrmoium (II)
  3. Insoluble in excess NaOH
    1. Nickel (II)
adding sodium hydroxide solution (NaOH)
1. green ppt
  1. insoluble in excess NaOH
    1. nickel (II)
    2. iron (II)
      1. green ppt turns brown with exposure to air
  2. soluble in excess NaOH to form green solution
    1. chromium (III)
2. white ppt
  1. insoluble in excess NaOH
    1. ppt is off-white and darkens on exposure to air
      1. manganese (II)
    2. magnesium
      1. colourless flame
    3. barium
      1. pale green flame
    4. calcium
      1. brick red flame
    5. strontium
      1. scarlet red flame
  2. soluble in excess NaOH to form a colourless solution
    1. zinc (II)
3. brown ppt
  1. insoluble in excess NaOH
    1. iron (III)
4. no ppt
  1. ammonia evolved on warming
    1. ammonium
  2. sodium
    1. yellow flame
  3. potassium
    1. lilac flame
5. blue ppt
  1. insoluble in excess NaOH
    1. copper (II)
adding barium chloride solution (BaCl)
1. white ppt
  1. ppt insoluble in dil HCl
    1. sulphate BaSO4
  2. ppt soluble in dil HCl
    1. sulphite BaSO3
  3. ppt soluble in dil HCl with effervescence
    1. carbonate BaCO3
adding silver nitrate solution AgNO3
1. white ppt
  1. soluble in dil aq NH3
    1. chloride AgCl
2. yellow ppt
  1. insoluble in conc aq NH3
    1. iodide AgI
3. cream ppt
  1. insoluble in dil aq NH3 but soluble in conc aq NH4
    1. bromide AgBr

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