balance the equation in basic conditions. phases are optional.

Question 1

Balance the following equation in basic conditions. Phases are optional.

CoCl2+Na2O2 = Co(OH)3+Cl- +Na+

(redox and oxidation reactions)

Question 2

Question 3

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Question 4

CoCl2 –> Co(OH)3 & 1 e-
cobalt loses 1 e- going from Co+2 to Co+3

H2O2 & 2e- –> Co(OH)3
while O2)-2 take a total of 2 e- going from O-1 each to O-2 each

so we have to double the Cobalt to balance the electrons taken and lost:
2CoCl2 –> 2 Co(OH)3 & 2 e-
H2O2 & 2e- –> Co(OH)3

combining these:
2CoCl2 (s) + 1Na2O2 (ag) —-> 2Co(OH)3 (ag)+Cl- (ag) + Na+ (ag)

let’s balance the Na’s:
2CoCl2 (s) + 1Na2O2 (ag) —-> 2Co(OH)3 (ag)+Cl- (ag) + 2Na+ (ag)

let’s balance the Cl’s:
2CoCl2 (s) + 1Na2O2 (ag) —-> 2Co(OH)3 (ag)+ 4Cl- (ag) + 2Na+ (ag)

let’s balance the net -2 on the right by adding 2 OH- to the left:
2CoCl2 & 1Na2O2 & 2 OH- —-> 2Co(OH)3 & 4Cl- & 2Na+

we need 4 more H’s on the left to balance the 6 H’s on the right, so add neutral water:
2CoCl2 & 1Na2O2 & 2 OH- & 2 H2O —-> 2Co(OH)3 & 4Cl- & 2Na+