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Redox reactions
colour changes for redox reactions
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| A | B |
|---|
| H2 | goes to H+, colourless to colourless |
| Zn | Zn2+, grey to colourless |
| Fe2+ | Fe3+, pale green to pale yellow |
| C2O4 2- | CO2, colourless to colourless |
| H2C2O4 | CO2, colourless to colourless |
| SO3 2- | SO4 2-, colourless to colourless |
| S2O3 2- | S4O6 2-, colourless to colourless |
| Mg | Mg2+, grey to colourless |
| MnO4 - (acidified) | Mn2+, purple to colourless |
| MnO4 - (neutral) | MnO2, purple to brown |
| MnO4 - (alkaline) | MnO4 2-, purple to green |
| Cr2O7 2- | Cr3+, orange to blue(green) |
| H2O2 | H2O, colourless to colourless |
| Cl2 | Cl-, pale green to white |
| ClO- | Cl-, colourless to colourless |
| I2 | I-, red-orange or black-purple to colourless or white |
| ClO3 - | Cl-, colourless to colourless |
| BrO3 - | Br-, colourless to colourless |
| IO3 - | I2, colourless to red-orange or black-purple |
| NO3 - | NO2,colourless to brown gas |
| Fe3+ | Fe2+, yellow/orange to pale green |
| Cu2+ | Cu+, (usually) blue to (usually) white |
| oxalate | C2O4 2- |
| oxalic acid | H2C2O4 |
| thiosulfate | S2O3 2- |
| sulfite | SO3 2- |
| dichromate | Cr2O7 2- |
| hypochlorite | ClO- |
| chlorate | ClO3 - |
| bromate | BrO3 - |
| iodate | IO3 - |
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