After you have dinner tonight wash your own plate with soap / detergent.
(a) What colour change is observed when soap / detergent is applied?
(b) Name the type of reaction and explain it.

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Solution

(a) When soap / detergent is applied on plate which has layer of oil and left food particles, the yellow oily left over stains turn red/ orange. And this colour change occurs because of neutralization.
(b) Turmeric (yellow colour) change to red / orange due to the neutralization reaction. Edible oils are compounds of alcohol's and organic acids, which get neutralized by alkaline soap / detergent. This neutralized reaction is indicated by turmeric (yellow) which turn red.

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After you have dinner tonight wash your own plate with soap / detergent.(a) What colour change is observed when soap / detergent is applied?(b) Name the type of reaction and explain it.

After you have dinner tonight wash your own plate with soap / detergent.
(a) What colour change is observed when soap / detergent is applied?
(b) Name the type of reaction and explain it.