Drill: Calculate the solubility of

PbSO4

Ksp = 2.0 x 10-14

Oxidation Reduction Reactions(REDOX)

REDOX Reactions

•Chemical reactions in which electrons

are transferred

Chemical Charge• A positive, neutral, or

negative number assigned to a particle & determined by

the difference between the # of protons & electrons

Oxidation Number

•The charge of a single atom

Oxidation•The act of losing

electrons

•Oxidation number increases

Reduction•The act of

gaining electrons

•Oxidation number decreases

REDOX Fact•You cannot have oxidation without

reduction or reduction without oxidation

Oxidizing Agent•A substance that oxidizes another

•The oxidizing agent will be reduced

Reducing Agent•A substance that

reduces another

•The reducing agent will be oxidized

Determine elements being: oxidized & reduced

MnO4-1 + NH3

MnO2 + NO2-1

Drill: determine ox # of each element:

MnO4-1 + Fe

Mn2O3 + FeO

Balance the following in Acid:

MnO4-1 + Fe

Mn2O3 + FeO

Balancing REDOX Reactions

Balancing Redox Rxns1)Determine all ox #

2)Determine elements being oxidized & reduced

3)Divide rxn into half-rxns

4)Balance half-rxns

Balancing Half-Rxnsa)Balance redox elements

b)Balance ox # with e-

c)Balance e- between the two half-rxns

Balancing Half-Rxnsd)Balance total charge

with H+ or OH-

e)Balance H’s with waterf) Check balance with oxygen

Balancing Redox Rxns5) Add the two half-reactions

a)Cancel like substances from each side of the full reaction

b)Check work

Drill: Determine Ox #:

MnO2 + Cl-1

Mn+2 + Cl2

in acid

Balance Redox Rxn:

MnO2 + Cl-1

Mn+2 + Cl2

in acid

Balance Redox Rxn:

Cr2O7-2 + NH3

Cr+3 + NO3-1

in base

Balance REDOX Rxn:

MnO4-1 + N2O3

Mn+2 + N2O5

in acid

Drill: Determine Ox # for All

MnO4-1 N2O3

Mn+2 N2O5

Balance Redox Rxn:

FeCl2 + KNO3

FeCl3 + KNO2

in base

Balance Redox Rxn:

SO2 + Pb(OH)2

SO3 + Pb

in base

Drill Balance the following half-reaction:

H2O O2

In acid

Balance Rxn:

HNO3 + Cu

N2O + Cu+2

Balance Redox Rxn:

Fe(NO3)3 + Cr(OH)4-1

Fe(NO3)2 + CrO4-2

Balance Redox Rxn:

SnF2 + KIO4

KI + SnF4

in acid

Balance Redox Rxn:

IO3-1 + I-1

I3-1

in acid

Balance Redox Rxn:

MnO2 + P4

Mn2O7 + PH3

in acid

Balance Redox Rxn:

PbBr2 + O2 + K+

PbBr4 + K2O

in acid

Balance Redox Rxn:

Ca + VO4-3

CaO + V+2

in acid

Balance Redox Rxn:

Ni(OH)2 + N2H4

Ni + N2

in base

Balance Redox Rxn:

P2O3 + K2CrO3

K3PO4 + Cr+2

in acid

Balance Redox Rxn:

SO + H2Cr2O7

H2SO4 + Cr+2

Balance Redox Rxn:

PH3 + KMnO4

P2O5 + Mn2O3

in KOH