(a) What does the pH of a solution signify? Three solution A, B and C have pH values of 6, 4 and 10 respectively. Which of the solutions is highly acidic?
(b) 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.
Answers
Answer:
The pH of a solution signifies the acidic or the basic nature of the substance.
a) Solution B is highly acidic.
b) Chemical materials that can be used in soil to adjust the pH are
- Chalk- Calcium carbonate (CaCO3)
- Slaked lime or quick lime - Calcium hydroxide (Ca(OH)2)
- Calcium oxide (CaO)
Farmer can Use Slaked Lime
Explanation:
(a) pH of a solution signifies the concentration of hydrogen ions in it. Solution B is highly acidic since it has the lowest pH (pH = 4).
or
pH of a solution signifies as a number which indicates the acidic or basic nature of a solution. Higher the hydronium ion concentration, lower is the pH value.
b.) So, According to pH of soil, the soil is acidic in nature. A farmer should treat the soil of his fields with quick lime (calcium oxide) or slaked lime (calcium hydroxide) or chalk (calcium carbonate) to neutralize the physical conditions of soil.
Slaked lime or Chalk can be used to treat acidic soil.