What volume of water should be added to 50 mL M/5 HCI solution to make

1.	What volume of water should be added to 50 mL M/5 HCI solution to make it decimolar?
Answer» Solution :The number of gram MOLES in 50 mL `M/5`HCI. `=(1/5 XX 50)/1000 =0.01` (No. of gram moles `=(M xx V)/1000`) Suppose, v mL of water should be added to make it decimolar. The total volume will now be = 50 + v mL. Number of gram moles of HCI in this DILUTED solution `=(1/10 xx (50 + v))/1000` The two gram moles should be equal. THEREFORE, `=(1/10 xx (50 + v))/1000 = 0.01` which gives v=50 mL HENCE, 50 mL of water should be added to 50 mL `M/5` HCI to make it decimolar.

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