(a) 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?
(b) Mention the nature of toothpastes. How do they prevent tooth decay?
Answers
Answer:
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Explanation:
(a) 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.
(b) Toothpastes are basic in nature. They neutralize the acid formed in mouth which causes tooth decay.
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Answer:
A) 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 used to promote oral hygiene: it is an abrasive that aids in removing dental plaque and food from the teeth, assists in suppressing halitosis, and delivers active ingredients (most commonly fluoride) to help prevent tooth decay (dental caries) and gum disease (gingivitis).
Explanation:
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