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Borek
#12
May10-11, 05:42 AM
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Problem is not in the nitric acid, but in the carbonate ion - it changes pH of the solution, as it reacts with water. Try to write reaction equation - as I wrote, you start witch CO32- and water, and CO32- is a weak Brønsted base, which means it will accept a proton (stealing it from the water molecule).

Now, think if that can happen if you add calcium carbonate to water?