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Question

The volume of water to be added to a mixture of 250ml of 6M HCl and 750 ml of 2M HCl to obtain 2.5M solution
  1. 1200 ml
  2. 1000ml
  3. 200 ml
  4. 100ml


Solution

The correct option is C 200 ml
M1V1+M2V2=M3V36×250+2×750=2.5×V3V3=1200 ml
Volume of water to be added =V3(V1+V2)
= 1200 – (250 + 750)
= 200 ml

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