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Solution


Q.

When the hydrogen ion concentration [H+] changes by a factor of 1000, the value of pH of the solution ______               [2023]
1 decreases by 3 units  
2 decreases by 2 units  
3 increases by 2 units  
4 increases by 1000 units  

Ans.

(1)

(pH)1=-logC

(pH)2=-log103C=-[log103+logC]

           =-3-logC

(pH)2-(pH)1=-3 ⇒ Decreased by 3