Please enable JavaScript.
Coggle requires JavaScript to display documents.
Flame tests (Test for ammonium ions (Apply stopper with conc HCl on it…
Flame tests
Test for ammonium ions
Apply stopper with conc HCl on it over the gas evolved
White fumes of ammonium chloride are seen
Apply red litmus paper and if NH3 is present it should go blue
Eg. NH4Cl + NaOH -> NaCl + NH3 + H2O
Add a solution of NaOH to either the solid or solution and warm mixture
Method
Mix solid to be investigated with a small volume of HCl on a watch glass
Dip the metal loop in sample and heat in the flame
Dip a platinum/ nichrome metal loop in conc HCl and place in the hot Bunsen flame to clean the wire
Record colour
Na + Yellow / orange
Li + Crimson red
K+ Lilac
Cs+ Blue/ voilet
Rb+ Red/ purple
Mg2+ no colour
Be2+ no colour
Ca2+ Orange red
Ba2+ Apple green
Sr2+ Crimson red