(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?
Answers
(a) 7.0–7.8.
During indigestion, stomach produces too much acid which causes pain. Antacids are alkaline and so neutralize the excess acid. 1 Milk of Magnesia is an antacid.
b) Bacteria change the fresh milk into curd producing lactic acid. Because of the presence of lactic acid in curd, the pH will come down from 6 to a lower value.
(c) Lactic acid formed as a result of fermentation is neutralised by sodium hydrogencarbonate . This prolongs the time taken by milk to set as curd .
(d) Toothpaste are alkaline in nature . It neutralises the acids in the mouth and prevents the decay of teeth.
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Answer: A) Our body works between the pH ranges 7.3−7.5 . Acidity is the excess of acid level in the stomach. Antacid contains basic salt, so whenever we take antacid it reacts with the excess acid of the stomach and neutralizes it.
B) When milk changes into curd there occurs a decrease in pH. It happens fact that lactose present in milk gets converted into lactic acid. As more acid is formed, the pH of the medium decrease.
C) As this milk is slightly more alkaline than others , therefore, acid produced to set into curd will be neutralized by baking soda added by milkman. Hence, this milk takes a long time to set as curd.
D) The nature of toothpaste is alkaline which is basic. They neutralize the acid produced by bacteria in the mouth. ... Usually tooth decay is caused due to acids so that we use bases to clean out teeth with alkaline-based toothpaste.