A student knew that it was to make copper (ii) sulphate crystals by adding copper (ii) carbonate to dilute sulphuric acid and warming the resulting solution to drive off some of the water and then leaving the solution to crystallize. he decided to make copper (ii) nitrate crystals by similar method. the only change he made was to use dilute nitric acid. he left the final solution for several days but failed to collect any crystals. explain why the student did not get any crystals to collect