Question

Write the shorthand notation for the galvanic cells represented in: 1. Cr2O7 ^2- + Cl- -->...

Write the shorthand notation for the galvanic cells represented in:

1. Cr2O7 ^2- + Cl- --> Cr ^3+ + Cl2

2. PbO2 + Sn --> Pb ^2+ + Sn ^2+

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Homework Answers

Answer #1

1)

reactant side Cr has oxidation number +6 and product side it is +3
decrase in oxidation number states that reduction of Cr take place
Cr will act as cathode

reactant side Cl has oxidation number -1 and product side it is 0
incrase in oxidation number states that oxidation of Cl take place
Cl will act as anode

so, reprsentation is
Cr+6/Cr+3//Cl-1/Cl

2)
reactant side Pb has oxidation number +4 and product side it is +2
decrase in oxidation number states that reduction of Pb take place
Pb will act as cathode

reactant side Sn has oxidation number 0 and product side it is +2
incrase in oxidation number states that oxidation of Sn take place
Sn will act as anode

so, reprsentation is
Pb+4/Pb+2//Sn/Sn+2

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