Q13 of 48 Page 9

To protect tooth decay we are advised to brush our teeth regularly. The nature of toothpaste commonly used is

Toothpastes we generally contain mild bases such as sodium fluoride or sodium bicarbonate in their composition. The base reacts with the acid formed during tooth decay and neutralises its bad effects thus, preventing tooth decay.


Note:


When we eat sweet things, the pH of our mouth falls below 5.5 (moderately acid) as the oral bacteria releases lactic acid while acting on sugars. The acidic conditions are capable to corrode the enamel as these are made up of calcium phosphate. This makes the tooth decay.

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11

Common salt besides being used in kitchen can also be used as the raw material for making

(i) Washing soda


(ii) bleaching soda


(iii) Baking soda


(iv) slaked lime

 12

One of the constituents of baking powder is sodium hydrogen carbonate, the other constituent is

 14

Which of the following statements is correct about an aqueous solution of an acid and a base?

(i) Higher the pH, stronger the acid


(ii) Higher the pH, weaker the acid


(iii) Lower the pH, stronger the base


(iv) Lower the pH, weaker the base

 15

The pH of the gastric juices released during digestion is