Question
- Write the functions of salt bridge in electro chemical cell.
- Give one decomposition reaction which is redox reaction and one which is a redox reaction.
✓
Answer
- Salt bridge.
- Completes internal circuit.
- It maintains electroneutrality.
- $\stackrel{{+4}}{\hbox{C}\text{a}}\stackrel{{-2+2}}{\hbox{CO}_3}(\text{s})\xrightarrow{\ \ \ \ \ \ \ \ }\stackrel{{+2}}{\hbox{Ca}}\stackrel{{-2}}{\hbox{O}}(\text{s})+\stackrel{{+4-2}}{\hbox{CO}_2}\text{(g)}$
It is not a redox reaction.
- $\stackrel{{+2+6}}{\hbox{Fe}}\stackrel{{-2}}{\hbox{SO}_4}\xrightarrow{\ \ \ \Delta \ \ \ \ \ }\stackrel{+3}{\hbox{Fe}}\stackrel{-2}{\hbox{O}_3}+\stackrel{{_-2}}{\hbox{SO}_2}+\stackrel{{+6-2}}{\hbox{SO}_3}$
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