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(i) Bee sting leaves a chemical substanc...

(i) Bee sting leaves a chemical substances that causes pain and irrigation. Name the chemical substance. Identify the type of substance which may give relief on the sting area when applied on it.
(ii) Mention the pH value below which tooth decay begins. How this fall below this value? Explain the ill effect of the acidic medium in the mouth. How can this be prevented?

Text Solution

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(i) Methanoic acid (HCOOH). Use of baking soda can give relief on the stung area when applied on it.
(ii) Tooth enamel, made of calcium phosphate does not dissolve in water. But it is corroded when pH is below 5.5 (acidic).
Bacteria present in the mouth produce acids by degradation of sugar and good particles remaining in the mouth. It can be prevented by using tooth paste, which is generally basic to neutralise excess acid.
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