KEAM 2016 Physics and Chemistry Paper

∵pH=−log [concentration]
Therefore, for change in one unit of pH, concentration must be changed to 10 times
pH=−log(10−1)
pH=log‌10=1
If pH‌‌=3‌ , then ‌
3‌‌=−log‌10−x
3‌‌=x‌log‌10⇒x=3
Thus for change in concentration (ie dilution) to get 3 times of pH, the solution must be diluted to 100 times, 1θ