Quick Revision- pH scale and its day to day application

Quick Revision

Topic: pH scale and its day to day application

Definition: pH scale is the scale developed to measure the concentration of Hydrogen ion in a solution. Here ‘p’

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S.no.	Application	Activity
1.	Digestion	Release of HCL in stomach to create acidic environment and eventually leading to breaking of food.
2.	Tooth decay	If pH reaches below 5.5, tooth decay starts. Best way is to rinse mouth thoroughly after consuming food.
3.	Agriculture	Plants grow best in neutral condition. If pH<7 add quick lime or slaked lime. If pH>7 then add decaying organic matter.
4.	Self defence by animal and plants	Protection by injection of acid and bases. For example When honey bee stings a person , it inject an acidic liquid into the skin. Rubbing with mild base like baking soda solution on the stung area of the skin gives relief.