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Why is this the best way of preparing lead(II)sulfate through lead(II) carbonate?
I cant understand why this is so, please help.
There are two options in this question:
1) Add excess sulfuric acid to lead(II)carbonate
2) Add excess nitric acid to lead(II)carbonate and then add excess sulfuric acid.
The answer is 2). Can anyone care to explain why this is so? Thanks in advance
Lead sulfate is insoluble, so you can't make it by adding sulfuric acid. Why? Because the lead sulfate would form a protective coating around the PbCO3 grains and stop further reaction.... because PbSO4 is insoluble. So you must dissolve it to make a soluble salt in solution, lead nitrate and then precipitate lead sulfate by sulphuric acid. It can then be filtered off and washed to leave it pure.
You shouyld have met a similar situation in basic chemistry making CO2 from CaCO3 in the form of marble chips. Works well with hydrochloric acid but stops after a few seconds with sulfuric acid as CaSO4 is insoluble and forms a protective coating.
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