Redox and qualitative analysis

Write the oxidation of Fe2+ to Fe3+ and state the colour change.
MnO4- + 8H+ + 5Fe2+ -------> Mn2+ +5Fe3+ + 4H2O Colour change is from purple(MnO4-) to colourless
1 of 5
How is Fe3+ reduced to Fe2+?
2Fe3+ + 2I- ------> 2Fe2+ + 2I2 Orange-brown--------> Pale green, but brown I2 formed
2 of 5
How is chromium reduced?
Cr2O72- + 14H+ + 3Zn ------> 2Cr3+ 7H2O + 3Zn2+ Colour change: orange to green
3 of 5
What is the oxidation of Cr3+ to CrO4(2-)?
3H2O2 + 2Cr3+ +10OH- -----> 2CrO4(2-) + 8H2O
4 of 5
Reduction of Cu2+ to Cu+?
2Cu2+
5 of 5

Other cards in this set

Card 2

Front

How is Fe3+ reduced to Fe2+?

Back

2Fe3+ + 2I- ------> 2Fe2+ + 2I2 Orange-brown--------> Pale green, but brown I2 formed

Card 3

Front

How is chromium reduced?

Back

Preview of the front of card 3

Card 4

Front

What is the oxidation of Cr3+ to CrO4(2-)?

Back

Preview of the front of card 4

Card 5

Front

Reduction of Cu2+ to Cu+?

Back

Preview of the front of card 5

Comments

No comments have yet been made

Similar Chemistry resources:

See all Chemistry resources »See all Transition metals resources »