Page No 28: - Chapter 2 - Acids Bases & Salts - Ncert Solutions class 10 - Science
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Question 1:
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?
Answer:
A pH value of less than 7 indicates an acidic solution, while greater than 7 indicates a basic solution. Therefore, the solution with pH = 6 is acidic and has more hydrogen ion concentration than the solution of pH = 8 which is basic.
Question 2:
What effect does the concentration of 
ions have on the nature of the solution?
Answer:
Concentration of 
can have a varied effect on the nature of the solution. With an increase in H+ ion concentration, the solution becomes more acidic, while a decrease of H+ ion causes an increase in the basicity of the solution.
Question 3:
Do basic solutions also have 
ions? If yes, then why are these basic?
Answer:
Yes, basic solution also has 
ions. However, their concentration is less as compared to the concentration of OH− ions that makes the solution basic.
Question 4:
Under what soil condition do you think a farmer would treat the soil of his fields with quick lime (calcium oxide) or slaked lime (calcium hydroxide) or chalk (calcium carbonate)?
Answer:
If the soil is acidic and improper for cultivation, then to increase the basicity of soil, the farmer would treat the soil with quick lime or slaked lime or chalk.
