do the same for part c steps Part C. Separating and Identifying the Group D Ion: Cu2+ Ion *Note: the porcelain crucible must be clean before continuing the analysis. To clean the crucible, rinse with concentrated nitric acid. Discard into the waste beaker. Caution: Nitrogen(IV) oxide (NO2) is a red-brown gas that is very toxic when inhaled. Prevent eye, skin, and clothing contact. Avoid inhaling the substance. Only work with NO2 in a fume hood. 1. Record all observations on Data Sheet 1. 2. Transfer the supernatant liquid remaining from Part C and labeled "Cu2+ Ions", to a clean*, porcelain crucible. Working in the fume hood, with the crucible cover slightly ajar, heat the contents of the crucible on a hot plate to dryness. Cool the crucible and its contents for 5 min. 3. Add 6 drops of concentrated HNO3 solution to the cooled crucible and heat the contents to dryness in the fume hood. Cool the crucible and its contents for 5 min. 4. Add 6 drops of 6M HCl solution to dissolve the mixed CuO residue in the crucible. Transfer the resulting solution to a clean test tube labeled "Cu2+ Ion", using a clean dropper. Rinse the crucible with 5 drops of distilled water and add the rinse to the test tube. Chemistry 202 College of the Canyons Spring 2025 Page | 186 5. Add 6M NaOH solution dropwise until the solution in the test tube tests weakly acidic to weakly basic to pH paper (pH 5-9). Add 1M NaOH solution until the solution tests strongly basic to pH paper (pH 12-13). 6. Record all o