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What would be the lab procedures for titrating lead nitrate out of water to find the...

What would be the lab procedures for titrating lead nitrate out of water to find the concentration of the lead nitrate?

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Answer #1

Use excess of standard KI solution to dissolve the precipitate formed & then back titrate the KI used in excess by iodometry. The following reaction takes place when Pb (NO3)2 reacts with KI

Pb (NO3)2 + 2KI = PbI2 (s) + 2KNO3

PbI2 + 2KI = K2PbI4 (aq) ........ [colorless]

The appearance of colorless solution indicates completion of the reaction due to formation of soluble complex K2PbI4 . However, it should be desirable to use excess KI solution ,and then back titrate it with standard Na2S2O3 solution using starch as indicator.

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