(a) What does the pH of a solution signify? Three solutions 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.
(a) pH is the potential of hydrogen and signifies the concentration of hydrogen ions in it. pH greater than 7 is considered as basic and lesser than 7 can be considered as acid. For neutral solutions, the pH will be 7.
Solution B with a lower pH value of 4 is highly acidic.
(b) Soil with pH 4.2 is acidic in nature. It can be treated with chemicals such as calcium oxide (quick lime) or calcium hydroxide (slaked lime) which are bases and neutralize the acidity of the soil. .
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