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Question 3. (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?


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Answer 1

Answer:

a) Our body can work within the pH of 6 –7.

Antacids are the base which neutralize the effect of acid in our stomach. One antacids is milk of magnesia.

b) When the milk changes to curd it's pH comes down to 5. It is because curd is acidic in nature and acid lies down the 7 in pH scale.

c) When milk is slightly alkaline, milkman adds small amount of baking soda to balance the milk pH and hence, this milk takes a longer time to set as curd.

d)Toothpastes are alkaline in nature. The bacteria creates acidic medium in our mouth and hence toothpaste neutralises the acid and doesn't allow tooth decay to occur.

Explanation:

How bacteria creates acidic medium in our mouth:—

Bacteria in your mouth break down the carbohydrates that we consume( simply food), releasing lactic acid. Which is acidic in nature and causes our mouth pH to set down.