Electrochemistry

Electrochemistry

Question

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

  • 0.1 L

  • 0.9 L 

  • 2.0 L 

  • 9.0 L

Answer

D.

9.0 L

Initial pH = 1, i.e. [H+] = 0.1 mole/litre
New pH = 2, i.e. [H+] = 0.01 mole/litre
In case of dilution: M1V1 = M2V2
0.1 ×1 =0.01 × V2
V2 = 10 litre.
A volume of water added = 9 litres.

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