calculate the volume of water required to add in mixture of 250 ml of 0.6 M HCl and 750ml of 0.2 M HCl to obtain 0.25 M solution of HCl.

Dear Student,

Molarity of the mixture of 0.6 M HCl and 0.2 M HCl isM1V1+M2V2=M3(V1+V2)or, 0.6×250+0.5×750=M3(250+750)or, M3=150+3751000=0.525 MNow, this solution is diluted to obtain 0.25 M solutionSo, M3(V1+V2)=M4V4or, 0.525×1000=0.25×V4or V4=5250.25=2100 mlVolume of water added=2100-1000=1100 ml 

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