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March 29, 2015

Homework Help: Chemistry-Experiment

Posted by Fresca on Friday, March 30, 2012 at 6:50pm.

I did an experiment where I had 5 ml of MgCl2, then 5 ml NH4 solution (NH4OH (aq)) was added and it was observed that a precipitate formed; cloudy solution. After I added 1g of NH4Cl(s), the solution clears up (transparent).

2nd experiment:
There was 5ml Lead (II) Nitrate in a test tube, 5ml sodium oxalate was added to it, a precipitation forms; cloudy solution. The precipitate settled and the liquid above it was decanted. After, dilute nitrite acid was added some precipitate dissolved (still a bit cloudy).

Can someone explain which of the species are reacting to form/dissolve the precipitate and how it dissolves after in both experiments? Providing the equilibrium equations would help with the explanation. Thanks

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