Advertisements
Advertisements
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.
APPEARS IN
संबंधित प्रश्न
You have two solutions, A and B. The pH of solution A is 6 and pH of solution B is 8. Which solution has more hydrogen ion concentration? Which of this is acidic and which one is basic?
What colour do the following indicators turn when added to a base or alkali (such as sodium hydroxide)?
litmus
What is an indicator? Name three common indicators.
How does a universal indicator work?
Water is a neutral substance. What colour will you get when you add a few drops of universal indicator to a test-tube containing water?
Under what soil conditions do you think a farmer would treat the soil of his fields with quicklime (calcium oxide), or slaked lime (calcium hydroxide) or chalk (calcium carbonate)?
State whether a solution is acidic, alkaline or neutral if its pH is:
(i) 9
(ii) 4
(iii) 7
(iv) 1
(v) 10
(vi) 3
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?
A student prepares solutions of (i) an acid and (ii) a base in two separate beakers. She forgot to label the solutions and litmus paper is not available in the laboratory. Since both the solutions are colourless, how will she distinguish between the two?
Lemon juice will turn ______.
