Advertisements
Advertisements
प्रश्न
What is the name of the indicator which can be used for testing the pH of a solution?
उत्तर
A universal indicator shows different colours at different concentrations of hydrogen ions in a solution and can be used for testing the pH of a solution.
APPEARS IN
संबंधित प्रश्न
Do basic solutions also have H+ (aq) ions? If yes, then why are these basic?
Fresh milk from cows has a pH of 6. So how does the pH change when this milk is turned to curd? Explain your answer.
A milkman adds a very small amount of baking soda to fresh milk. Why does he shift the pH of the fresh milk from 6 to slightly alkaline?
The property which is common between vinegar and curd is that they:
(a) have sweet taste
(b) have bitter taste
(c) are tasteless
(d) have sour taste
Which is more acidic : a solution of pH = 2 or a solution of pH = 6?
The pH of soil A is 7.5 while that of soil B is 4.5. Which of the two soils, A or B, should be treated with powdered chalk to adjust its pH and why?
Fill in the following blank with suitable words:
Neutral substances have a pH of ................
What would you expect the pH of pure water to be?
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 group of students measured the pH of some substances they found in their homes. Their results are given in the following table:
| Substance | pH | Substance | pH |
| Apples | 3.0 | Salt | 7.0 |
| Baking soda | 8.5 | Sugar | 7.0 |
| Black coffee | 5.0 | Toothpaste | 9.0 |
| Household ammonia | 12.0 | Vinegar | 3.0 |
| Lemon juice | 2.5 | Washing soda | 11.5 |
| Milk | 6.5 |
(a) What would the students have used to measure the pH?
(b) Which solution is the most acidic?
(c) Which solution is the most alkaline?
(d) Which solutions are neutral?
(e) Which solution can be used to treat wasp stings?
(f) Which solutions can be used to treat bee stings?
