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Characteristic of Chemical Reactions :
what is change in colour ???
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ksahiL1:
evolution of gas , change in temperature, change in state, formation of precipitate and last one is change in colour
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Some chemical reactions are characterised by change in colour
For Ex:1)When citric acid reacts with potassium permanganate (purple) then purple colour disappears
2)When sulphur dioxide gas reacts with acidified potassium dichromate,change in colour from orange to yellow is observed.
For Ex:1)When citric acid reacts with potassium permanganate (purple) then purple colour disappears
2)When sulphur dioxide gas reacts with acidified potassium dichromate,change in colour from orange to yellow is observed.
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Some examples of change in color are:
When iron turns from silver to reddish-brown on catching rust.
Phenolphthalein is a universal indicator, which means it changes color to show the pH of certain solutions. Phenolphthalein stays colorless in acidic solutions and turns pink in alkaline solutions.
When you add starch to iodine in water, it creates a starch/iodine complex with an intense blue color. To test whether starch is present in a foodstuff, mix a solution of iodine and potassium iodide in water. The solution has a light orange-brown color, but when you apply it directly to a sample that contains starch (such as potatoes or bread), it turns a blue-black color.
When iron turns from silver to reddish-brown on catching rust.
Phenolphthalein is a universal indicator, which means it changes color to show the pH of certain solutions. Phenolphthalein stays colorless in acidic solutions and turns pink in alkaline solutions.
When you add starch to iodine in water, it creates a starch/iodine complex with an intense blue color. To test whether starch is present in a foodstuff, mix a solution of iodine and potassium iodide in water. The solution has a light orange-brown color, but when you apply it directly to a sample that contains starch (such as potatoes or bread), it turns a blue-black color.
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