CGPET 2021 Solved Paper

(c) If pH of solution increased from 3 to 6,H+ion concentration will be reduced to 1000 times.
pH=−log[H+]
[H+]‌when‌pH=3,
3=−log[H+]
antilog (−3)=[H+] ........(i)
10−3=[H+]........(i)
Also, [H+]‌when‌pH=6,
6=−log[H+]
antilog (−6)=[H+]
10−6=[H+].......(ii).....(ii)
From (i) and (ii), it can be seen if pH is increased from 3 to 6,H+concentration will be reduced by 1000 times.