Christie Hua Chem 1A-AL Pollak EXPERIMENT 4 – DISCUSSION In this experiment, we observed how metals reacted with water and acid and learned how to figure out the molecular formula of a compound by using acid-base titration. First, we observed how zinc and calcium reacted with acid and water. When zinc reacted with 6 M HCI, the mixture began to bubble vigorously with heat but gradually simmered down. However, when zinc reacted with water, nothing happened. When calcium reacted with 0.02 M HCl, cloudy and smoky rings of precipitate and foamy gas began rising in cycles from the bottom of the test tube. Some dust stones formed at the bottom of the tube, and residue clung to the sides. When calcium reacted with water, the mixture began bubbling and steaming very quickly, and a 1 ½ inch layer of dense murky gas and bubbles formed at the top of the mixture. Equations for: Zinc and 6 M HCl: 2Zn(s) + 2HCl(aq) 2ZnCl(aq) + H2(g) Ca + 0.02 M HCl: Ca(s) + 2HCl(aq) CaCl2(aq) + H2(g) Zinc and water:
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