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Chem Exp. Rep. 3

Chem Exp. Rep. 3 - Experiment Report The Chemistry and...

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03/09/08 Experiment Report: The Chemistry and Qualitative Analysis of Cations: Group III and IV PURPOSE: The purpose of this lab was to explore the chemistry in Group III and IV cations, namely Iron (III), Chromium (III), Nickel (II), Barium (II), and Calcium (II). This experiment also gave a better understanding of aqueous chemistry, such as when a chemical reaction occurs and when a chemical is dissolved in solution. We also used some Acid-Base chemistry by adding Nitric Acid, Sodium Hydroxide or Ammonia to turn a solution either acidic or basic. Finally, this lab also required us to some precipitation reactions, as we had to distinguish what the precipitate was during some reactions and extract the metal cations from the precipitate. RESULTS AND DATA: II. Separating and Confirming Selected Group III Cations: A. Precipitating Selected Group III Cations: Adding HNO 3 – Solution turns brownish-yellowish with brown precipitate Heating – Upon heating, solution turns into black color Adding NH 3 – Gas forms, smells of rotten eggs B. Separating and Confirming Chromium (III): Adding NH 3 – Solution becomes much warmer Adding 3% H 2 O 2 – Bubbles form; solution turns into brownish-yellow color; orange precipitate slowly forms.
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