16. Answer in detail III

 

Bees and red ants both contain formic acidtannic acidoxalic acidcitric acid. When bees or red ants bite us, they send the acid into our bodies. This acid creates pain and a burning sensation. To neutralise this acid and reduce the pain, a suitable base in the form of potassium hydroxidecalcium hydroxidecalcium carbonate is applied.

 

 

When a wasp bites, it injects a/an alkaline substance basic substanceacedic substance into our bodies, causing pain and a burning sensation. To neutralise this, we add magnesium hydroxidecarbonic acidvinegar.

 

 

Doctors generally recommend that we wash our teeth twice a day. This is because the bacteria in our mouth decompose the food particles trapped between our teeth, resulting in the development of basealkalineacid, which causes tooth decay. To prevent this, we have to neutralise. So we have to brush with tooth powder or toothpaste containing strong acidsweak basesstrong basesweak acids. As a result, we will have healthy and strong teeth.
 
Acidity:

 

Excessive production of hydrochloric acid in our stomach causes ulcer in stomach and food pipe.
In order to neutralize, antacids which are nothing but weak bases like aluminum and calcium hydroxidessodium hydroxidespotassium hydroxidesmagnesium hydroxides  are used.

 
Farmers add lime fertilisers such as \(CaCO_2\), \(CaOH\)\(CaO\), \(CaCO_3\)\(CaO\), \(CaCO_2\) or ashes of burnt wood to the soil to neutralise the acidity.

 

Effluents from the industries contain acids such as sulphuric acid. It is treated by adding ashescoallimestonelime to neutralise it before it is discharged into rivers and streams.