Why potato turns green on passing current? Around which terminal greenish patch is observed?
Answers
Suppose we want to pass current through potato. So, we connect ends of a battery by copper wire with potato by inserting in it. The electrons from negative potential of battery through copper wire reach in potato where they undergo in electrolysis of part of copper wire inside the potato in the presence of potato juice (starch). This process release electrons in potato and increase the negative particles. When these negative species reach the other end of copper it reacts with part of copper wire inside potato and make a complex of copper which is green in color.
This is the reason of greenish spots in potato on passing current through it.
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Potato turns green on passing current because-
1. Potato contains starch and it is a source of carbohydrate.
2. The potato will react chemically when the current is passed through the potato.
3. The movement of electrons takes place when copper wires are inserted in the potato.
4. The ions move from the negative terminal towards the positive terminal. On reaching, it reacts with the wire connected to the positive terminal. The reaction and the presence of starch lead to greenish spots on the potatoes.
5. The greenish patch is observed around the positive terminal.