Redox

Question 0

Give the titration equation for Cr2O72- and Fe2+

Answer 0

Cr2O72- + 6Fe2+ + 14H+ = 2Cr3+ + 6Fe3+ + 7H2O

Question 1

Give the equation for Fe2+ and MnO4-

Answer 1

MnO4- + 8H+ + 5Fe2+ = Mn2+ + 4H2O + 5Fe3+

Question 2

What is the equivalency ratio for Cu2+ and thiosulphate (S2O32-) ions?

Answer 2

1 to 1

Question 3

What are the 4 steps in making balanced ion-electron half equations?

Answer 3

1. Balance all atoms (except O and H)
2. Balance O by adding water
3. Balance H by adding H+ aq
4. Balance the charge by adding e- to more positive side

Question 4

What are the equations for converting orange dichromate (VI) to yellow chromate (VI)?

Is it redox?

Answer 4

Cr2O72- + 2OH- = 2CrO42- + H2O

2CrO42- + 2H+ = Cr2O72- + H2O

NO!