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

Options

  1. A2 . 0
  2. B9 . 0
  3. C0 . 1
  4. D0 . 9

Correct answer

B. 9 . 0

Step-by-step solution

pH = 1 = - log   [ H + ] [ H + ] = 10 - 1   M Final   pH = 2 ;   [ H + ] = 10 - 2   M M 1 V 1 = M 2 V 2 ( 0 . 1   M ×   1   Litre ) = ( 0 . 01 )   V 2 V 2 = 10   L Final volume =   10   L Water added = 10 - 1 = 9   L .

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