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प्रश्न
Explain the pH change as the cause of tooth decay. How can tooth decay caused by pH change be prevented?
उत्तर
When the pH of the mouth falls to around 5.5, tooth decay begins. As the acidity in the mouth increases, the acid reacts with the tooth enamel and causes tooth decay.
Tooth decay can be prevented by brushing with toothpastes (which are basic and neutralise the acid formed) regularly and by cleaning the mouth carefully after meals.
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संबंधित प्रश्न
The property which is not shown by acids is:
(a) they have sour taste
(b) they feel soapy
(c) they turn litmus red
(d) their pH is less than seven
What is the pH of a neutral solution?
Fill in the following blank with suitable words:
Neutral substances have a pH of ................
(b) Name the acid or alkalis used to make (i) car batteries (ii) explosives (iii) soaps (iv) fertilisers.
What would you expect the pH of pure water to be?
Someone put some universal indicator paper into vinegar. The pH is 3. What does this tell you about the vinegar?
The colour of methyl orange indicator in a solution is yellow. The pH of this solution is likely to be:
(a) 7
(b) less than 7
(c) 0
(d) more than 7
Fresh milk has a pH of 6. When milk changes into curd, the pH value will:
(a) become 7
(b) become less than 6
(c) become more than 7
(d) remain unchanged
The pH values of five solutions A, B, C, D and E are given below:
| A | 1 |
| B | 5 |
| C | 7 |
| D | 11 |
| E | 13 |
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?
