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How would you analyze a solution known to contain Pb2+ and As3+?

How would you analyze a solution known to contain Pb2+ and As3+?

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Answer #1

we can perform the qualitative test to know whether these metals are present or not:

both of these metals react with the H2S to give black and yellow precipitate.

Pb2+   + H2S ---------> PbS (ppt) + 2H+ (blacK ppt)

2As3+   + 3H2S -------> As2S3(ppt) +6 H+ Yellow ppt)

confirmation of lead :-

Pb2+   + 2KI ------------> PbI2(yellow ppt) +2K+

confirmation of arsenic :-

As2S3  + 10 HNO3 ------------->2H3AsO4   + 10 NO2  + 3S(soluble) +2H2O

H3AsO4  + 12 (NH4)2MoO4  + 21 HNO3 ----------------->(NH4)3AsO4.12MoO3(yellow ppt)​   +21 NH4NO3  +12 H2O

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