Discussion Forum



1)

How many litres of water must be added to 1L  of an aqueous solution of HCl with a pH of 1 to create an aqueous solution with pH of 2?


A) 0.1 L

B) 0.9 L

C) 2.0 L

D) 9.0 L

Answer:

Option D

Explanation:

 pH = 1 $\therefore$ [H+]=10-1=0.1M

pH = 2  $\therefore$  [H+]=10-2 =0.01 M

 For dilution of HCl    M1V1 =M2V2

  0.1 X 1=0.01 X V2

  V2=10 L

 Volume of water  to be added

               =10-1=9L