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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) it work well with a ph around 7(7.3 to 7.5).antacids give relief from acidity because antacid contains base such as magnesium hydroxide which nuetralises the acid and we feel relief

b)it ph will increase and will be higher than 7 because it will turn acidic

c)the milk take longer time to set as a curd because on adding baking soda(nahco3) which is a base it turn into base or the ph value increases and it take longer time to set curd

d)the tooth paste are alkaline or basic(having a ph value of 8) in nature which help to nuetralise the acid(which causes tooth decay) present in the teeth.tooth decay start when the ph value falls below 5.5