Question

 (a) Mention the pH range within which our body works. Explain how antacids
give relief from acidity. Write the name of one such antacid.

(b) Fresh milk has a pH of 6. How does the pH will change as it turns to curd? Explain your answer.

(c) A milkman adds a very small amount of baking soda to fresh milk. Why does this milk take a longer time to set as curd?

(d) Mention the nature of toothpastes. How do they prevent tooth decay?​

Answer 1

Answer:

hiiiii

your answer is here

Explanation:

(a) Our stomach has pH equal to 2. Antacids neutralizes excess of acid in our body and gives relief from hyperacidity. Sodium hydrogencarbonate is one of such antacid.

(b) pH will decrease as it turns to curd because curd is acidic due to the presence of lactic acid.

(c) It takes longer time to set as curd as bacteria do not work well in presence of sodium hydrogencarbonate, i.e. fermentation will take place slowly.

(d) Toothpastes are basic in nature. They neutralize the acid formed in mouth which causes tooth decay.

follow me !

Answer 2

Answer:

• Our body works roughly between 7.3 to 7.5 pH range. Acidity means excess ot acid level in stomach. Antacid contains basic salt. so when we take antacid it reacts with excess acid of stomach and neutralize .(neutralization reaction takes place between acid and base).Commonly used antacids contains at least one of these key ingredients: Calcium Carbonate, Magnesium Hydroxide, Aluminum Hydroxide and/or Sodium Bicarbonate.
• When milk is turned into curd then its pH value will decrease due to the production of lactic acid in curd which is acidic in nature. When milk turns into curd then it starts showing all properties of acid. It turns sour and the ph value decreases from 6.
• By adding a very small amount of baking soda to fresh milk, the milkman keeps the milk unspoiled for little more time than usual time. As the pH value increases the milk turns to slightly alkaline. Hence this milk takes a long time to set as a curd.
• Toothpaste is alkaline in nature. The action of bacteria occurs in acidic medium in the mouth and hence toothpaste neutralises the acid and doesn't allow tooth decay to occur.