Importance of pH in Daily Life


 
 
Concept Explanation
 

Importance of pH in Daily Life

The pH values of some common solutions

How is pH measured?

The pH of a solution is generally determined with the help of a pH paper, or universal indicator. The pH paper gives a particular colour with a solution of particular pH. The colour is compared with a chart which has different colours at different pH values.

Role of pH in everyday life:

1. In our digestive system: Hydrochloric acid produced in our stomach helps the digestion of food without causing any harm to the stomach. But when the amount of the acid goes beyond a certain limit due to indigestion, pain and irritation are created in the stomach. So, in order to neutralize the effect of excess acid, a mild base called antacid is usually taken. Magnesium hydroxide (milk of magnesia) is a mild base which is usually used as an antacid.

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Sample Questions
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Question : 1

Tooth decay starts when the pH of the mouth is lower than ________________

Right Option : D
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Question : 2

In which of the following pH ranges does our body work?

Right Option : C
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Question : 3

Which of the following are correct :

(a) Saliva, which is slightly alkaline, produced in the mouth neutralizes some acid, but excess acid remains unaffected.

(b) When the pH in mouth becomes lower than 5.5, tooth enamel gets corroded.

(c) As a result of physical exercise, stiffness and pain in the muscle starts due to the formation of lactic acid.

Right Option : D
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