Thursday, October 29, 2009

Magic Golden bangles of Chemistry!

In my college Chemistry laboratory there are racks and racks of small reagent bottles containing various chemical solutions. As a curious chemistry student then, I used to see the reactions as when a reagent is added to another one or multiple reagents added to a single one in a test tube. It was really adventurous to note the various chemical reactions taking place - change of color, production of colored solution from colorless one, precipitation of solids as a magic from a solution and colored vapors coming out with specific odors! A wonderful reaction to which one of our lecturers

introduced was the production of 'Golden bangles'! This wonder display of golden particles coming out is seen when Potassium iodide solution is added to Lead nitrate solution.

Pb(NO3)2 + 2KI --------> PbI2 + 2KNO3

Lead nitrate + Potassium iodide --------> LeadII iodide + Potassium nitrate

This reaction is also known as 'Golden Rain reaction.' The exciting golden particles are that of Lead iodide.You can find their display yourself if you have access to these reagents and see this chemical wonder!

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