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प्रश्न
A farmer has found that the pH of soil in his fields is 4.2. Name any two chemical materials which he can mix with the soil to adjust its pH.
उत्तर
If the pH of the soil is 4.2, then it is highly acidic. Hence, the soil should be treated with chemicals (bases) such as quick lime (calcium oxide) or slaked lime (calcium hydroxide).
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संबंधित प्रश्न
Fill in the blank in the following sentences:
Acids have a ..........................taste and they turn..........................litmus to..........................
Why does tooth decay start when the pH of mouth is lower than 5.5?
Name the indicator which can give us an idea of how strong or weak an acid or base is.
Two solutions A and B have pH values of 3.0 and 9.5 respectively. Which of these will turn litmus solution from blue to red and which will turn phenolphthalein from colourless to pink?
Fill in the following blank with suitable words:
The more acidic a solution, the ................. the pH.
Explain how pH change in the lake water can endanger the lives of aquatic animals (like fish). What can be done to lessen the danger to the lives of aquatic animals in the lake?
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 |
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 |
What is the colour of phenolphthalein in the basic solution?
Write a note on:
Litmus
