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प्रश्न
Why does tooth decay start when the pH of mouth is lower than 5.5?
उत्तर
Tooth enamel is made up of calcium phosphate and is the hardest part of the body. When the pH in the mouth goes down and becomes 5.5, it is strong enough to corrode the enamel of the tooth. The mouth turns acidic because the bacteria present in it produce acids by breaking down sugar and food particles left behind in it after eating.
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संबंधित प्रश्न
Indicator is a substance which shows different colours in acidic and basic solutions.
Two solutions X and Y are tested with universal indicator. Solution X turns orange whereas solution Y turns red. Which of the solutions is a stronger acid?
Separate the following into substances having pH values above and below 7. How do these influence litmus paper?
(i) Lemon juice
(ii) Solution of washing soda
(iii) Toothpaste
(iv) Vinegar
(v) Stomach juices
What effect does the concentration of OH− ions have on the nature of a solution?
The daffodil plants grow best in a soil having a pH range of 6.0 to 6.5. If the soil in a garden has a pH of 4.5, which substance needs to be added to the soil in order to grow daffodils?
(a) salt
(b) lime
(c) sand
(d) compost
Solution A turns universal indicator blue to purple whereas solution B turns universal indicator orange to red.
What will be the action of solution A on litmus?
Solution A turns universal indicator blue to purple whereas solution B turns universal indicator orange to red
What will be action of solution B on litmus?
Solution A turns universal indicator blue to purple whereas solution B turns universal indicator orange to red.
Name any two substances which can give solutions like B.
Explain why the pH in a person's mouth becomes lower after each meal.
Turmeric and litmus are _________ acid-base indicators.
