Опит 7: Светофар
Опит при който се извършва взаимодействие между разтвор на калиев перманганат с разтвор на захар с вода и натриева основа. При смесването цвета е лилав, след това тъмно син, зелен и накрая жълт. При реакцията калиевия перманганат се редуцира до жълт манганов диоксид.
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