Write two examples where you observe the formation of yellow and white precipitate
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Yellow
When potassium iodide solution reacts with lead (II) nitrate solution, a yellow precipitate called lead (II) iodide is formed.
White
White precipitate of barium sulfate forms if sulfate ions are present. The hydrochloric acid is added first to remove any carbonate ions that might be present - they would also produce a white precipitate, giving a false positive result. Barium nitrate solution can be used instead of barium chloride solution.
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yellow ppt :-
1. Pb(NO3)2 + KI = PbI2(ppt.) + KNO3
2. Pb(NO3)2 = PbO(ppt.) + NO2 + O2 <on heating>
white ppt :-
1. BaCl2 + Na2SO4 = BaSO4(ppt.) + NaCl
2. AgNO3 + KCl = AgCl(ppt.) + KNO3
Explanation:
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