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’ in pH implies ‘potenz’ in german. The pH of a neutral solution is 7. for Acidic solution pH is less than 7 and for basic solution pH is greater than 7.
Application of pH in day to day life:
| 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. |