Transcript Gas Forming Rxns, Driving Forces, and Redox

Gas Forming Rxns, Driving
Forces, and Redox
Chapter 5 part 3
Gas Forming Reactions
 Carbonate (CO32-)/bicarbonate (HCO3-)
react with acid (H+) to make CO2 and
H 2O
 NaHCO3 (s) + HCl --> NaCl + CO2(g) + H2O
Net ionic:
NaHCO3 + H+ --> Na+ + CO2(g) + H2O
Gas Forming Reactions
 Sulfite (SO32-) reacts with acid (H+) to
make SO2 and water
“Driving Forces”
The formation of a special product moves these
reaction forward:
 Precipitation - solid
 Acid-Base - water
 Gas-Forming - gas molecule
“Driving Forces”
 Product or Reactant Favored?
 2Na3PO4 + 3Ni(NO3)2 --> 6 NaNO3 + Ni3(PO4)2
 CaCl2 + H2O --> Ca(OH)2 + HNO3
“Driving Forces”
 The transfer of e- moves redox reactions
forward
 An oxidized substance provides e- to the
reduced substance
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
Redox Reactions
 HCl + Zn --> ? + ?
 Show the movement of e-
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
Oxidation Numbers
Refer to the handout
Assign Ox# to the Element
NH3
CaCl2
ClO4ClO3-
H3PO4
C3H8
Oxidation
number of F
in HF?