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IGCSE Chemistry Analysis

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fewuzolo's version from 2016-05-18 19:50

Flame Test

TestIon
Burns to give a blue-green flameCu2+ Copper (ii)
Burns to give a red flameLi+ Lithium
Burns to give a yellow flameNa+ Sodium
Burns to give a lilac flameK+ Potassium
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NaOH(aq)

TestIon
Gives a white ppt. which is soluble in excess to give a colourless solution (Two possible answers)Zinc Zn2+ or Aluminium Al3+
Gives a white ppt. which is insoluble in excessCalcium Ca2+
Gives a light blue ppt. which is insoluble in excessCopper(ii) Cu2+
Gives a green ppt. which is soluble in excess to give a dark green solutionChromium Cr3+
Gives a green ppt. which is insoluble in excessIron(ii) Fe2+
Gives a red-brown ppt. which is insoluble in excessIron(iii) Iron3+
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NH3(aq)

TestIon
Gives a white ppt. which is soluble in excess to give a colourless solutionZinc Zn2+
Gives a white ppt. which is insoluble in excessAluminium Al3+
Gives a slight white ppt. or no reactionCalcium Ca2+
Gives a light blue ppt. which is soluble in excess to give a dark blue solutionCopper(ii) Cu2+
Gives a grey green ppt. which is insoluble in excessChromium Cr3+
Gives a green ppt. which is insoluble in excessIron(ii)Fe2+
Gives a red-brown ppt. which is insoluble in excessIron(iii) Fe3+
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Anions

TestIon
Add dilute acid HCl. Effervescence which turns lime water from clear to cloudyCarbonate CO3 2-
Nitric acid then add aqueous silver nitrate. White precipitate formed.Chloride Cl-
Nitric acid then add aqueous silver nitrate. Cream precipitate formed.Bromide Br-
Nitric acid then add aqueous silver nitrate. Yellow precipitate formed.Iodide I-
HCl then add aqueous barium chloride. White precipitate formed.Sulfate SO4 2-
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