CBSE Class 10 Science 2021 Term 1 Solved Paper

Question : 26

Total: 60

Consider the pH value of the following acidic samples: The decreasing order of their H+ion concentration is

S.No.	Sample	pH Value
1.	Lemon Juice	2.2
2.	Gastric Juice	1.2
3.	Vinegar	3.76
4.	Dil. Acetic acid	3.0

3>4>1>2
2>1>3>4
2>1>4>3
3>4>2>1

Solution:

For a solution, the more the H+ ion concentration, solution will be acidic. On the pH scale, 7 is neutral, higher than 7 is basic and less than 7 is acidic. The pH scale given below is depicting that as the solution becomes more and more acidic, the H+ion concentration increases and as it becomes more and more basic the H+ion concentration decreases and OH−ion concentration increases. pHSCALE
Concentration of H+>OH−Concentration of H+<OH−

at pH=7(. at 25∘C or 77∘F) the number of OH− ions is equal to the number of H+ions.
Thus, the correct decreasing order of H+ion concentration in the given acidic sample will be:
Gastric Juice > Lemon Juice > dil. Acetic acid > Vinegar

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