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Grade: 12th pass
        
why chemicals like KI solution,  sodium bicarbonate , etc. are used in the experiment " estimation of Cu in CuSO4 using Na2S2O3 solution? 
7 months ago

Answers : (1)

Arun
21438 Points
							

Copper ions are reduced by the iodide ions to copper(I). The best way to look at this is via the half equations:

Cu2+ + 1e --> Cu+ 
2I- --> I2 + 2e

to balance these you double the first equation (to equalise the electrons) and add them together.

2Cu2+ + 2e --> 2Cu+ 
2I- --> I2 + 2e
------------------------------------------------------------- add
2Cu2+ + 2I- --> 2Cu+ + I2

Now add in the spectator ions:

2CuSO4 + 2KI --> Cu2SO4 + I2 + K2SO4

So the white precipitate is copper(I) sulphate and the brownish coloration is iodine solution...


 
7 months ago
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