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Gas Forming Rxns, Driving Forces, and Redox

Gas Forming Rxns, Driving Forces, and Redox. Chapter 5 part 3. Gas Forming Reactions. Carbonate (CO 3 2- )/bicarbonate (HCO 3 - ) react with acid (H + ) to make CO 2 and H 2 O NaHCO 3 (s) + HCl --> Net ionic:. NaCl + CO 2 (g) + H 2 O. NaHCO 3 + H + --> Na + + CO 2 (g) + H 2 O.

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Gas Forming Rxns, Driving Forces, and Redox

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  1. Gas Forming Rxns, Driving Forces, and Redox Chapter 5 part 3

  2. Gas Forming Reactions • Carbonate (CO32-)/bicarbonate (HCO3-) react with acid (H+) to make CO2 and H2O • NaHCO3 (s) + HCl --> Net ionic: NaCl + CO2(g) + H2O • NaHCO3 + H+ --> Na+ + CO2(g) + H2O

  3. Gas Forming Reactions • Sulfite (SO32-) reacts with acid (H+) to make SO2 and water

  4. “Driving Forces” The formation of a special product moves these reaction forward: • Precipitation - solid • Acid-Base - water • Gas-Forming - gas molecule

  5. “Driving Forces” • Product or Reactant Favored? • 2Na3PO4 + 3Ni(NO3)2 --> 6 NaNO3 + Ni3(PO4)2 • CaCl2 + H2O --> Ca(OH)2 + HNO3

  6. “Driving Forces” • The transfer of e- moves redox reactions forward • An oxidized substance provides e- to the reduced substance

  7. Redox Reactions • Oxidation and Reduction occur together • OILRIG • Oxidation - “loss of e-” • the oxidation # (charge) element gets higher • Reduction - “gain of e-” • the ox # of element gets lower

  8. Redox Reactions • HCl + Zn --> ? + ? • Show the movement of e-

  9. Recognizing REDOX • First assign ox # to each element • The charges must change in a redox rx • If element ends up with a higher ox# its oxidized • If element ends up with a lower ox# it is reduced

  10. Oxidation Numbers • Refer to the handout

  11. Oxidation number of F in HF? Assign Ox# to the Element NH3 CaCl2 ClO4- ClO3- H3PO4 C3H8

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