After adding HNO 3 again Formed cloudy gasvapour above liquid solution After

After adding hno 3 again formed cloudy gasvapour

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After adding HNO 3 again: Formed cloudy gas/vapour above liquid solution After adding NH 3 again: Clear liquid, lost some heat After adding KI: Bottom part of solution is unchanged Top part of solution becomes: Whitish Cloudy Translucent Slightly yellow at border that separates top and bottom portions of solution After adding Na 3 S: Cloudy, whitish portion becomes brown Precipitate formed in brown portion
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Bottom remains unchanged Buffer Experiment (Part 3) Observations: NaHCO 3 : Fine White Opaque Powdery Expected initial pH of water to be closer to 7. It happened to be slightly acidic with a pH of 6.20 Current state of solution pH value (3 significant figures) pH of water 6.20 pH after NaHCO 3 is dissolved 8.33 pH adding HCL to sol’n 7.34 pH after adding Lactic Acid 7.22 pH after adding NaHCO 3 again 7.35 pH after adding NaHCO 3 for third time 7.44 pH after adding dry ice 7.43 pH after adding NH 4 Cl 7.42 Discussion: Report Questions 1. a) NH 4 Cl lowers blood pH and has a diuretic effect, which is designed to increase the amount of bodily fluids. NH 4 Cl also maintains the acid-base balance. Hydrochloric acid is a corrosive solution which will kill red blood cells.
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b) NH 4 NO 3 and NH 4 I do not have the same effect on blood pH as NH 4 Cl. NH 4 NO 3 is also used as a fertilizer. NH 4 NO 3 will disassociate to completion which would minimize the buffering effect. NH 4 I is also less effective at disassociating than NH 4 Cl. 2. Anytime we added an acidic substance to the solution we noticed a decrease in pH. The most significant difference we observed was after adding HCl; the pH went from 8.33 to 7.34. NaHCO 3 + HCl H 2 O + NaCl + CO 2 3. When the pH in the human body is lower than normal (acidosis), it generally means that there is a higher concentration of CO 2 . This decrease in pH causes hemoglobin to bind to more oxygen and transport it around your body in order to stabilize the pH and return it back to a healthy level.
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  • Fall '14
  • Pell, Wendy

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