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Old Aug 4th 2017, 01:36 PM   #1
buddingscientist
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Penny in Nitric Acid forms crystals

Completed an experiment with a penny dissolving in nitric acid. This usually just forms an aqueous solution but this time crystals formed. Can't figure out why. Only nitric acid was used. Any thoughts?
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Old Aug 5th 2017, 08:53 PM   #2
oz93666
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I believe crystals will only form is there isn't enough water to dissolve them....

I imagine some heat was generated ....so when the reaction was over you had a hot saturated solution of copper? nitrate and nitric acid ... as it cooled some copper nitrate will crystallize out.
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