Question

You have 505 mL of a 0.130 M HCl solution and you want to dilute it to exactly 0.100 M. How much water should you add

Answer 1

Answer: 0.657 L or 657 mL

Step-by-step explanation:

The dilution equation is M₁V₁=M₂V₂ where M is the molarity before and after dilution and V is the volume of solvent.

M₁ is 0.130 as that is the molarity before dilution. V₁ is 0.505 L (converting mL to L is a good practice, though not necessary for this particular problem).

M₂, the molarity we want to achieve, is 0.1.

So, plugging into the above equation, we have

`0.130*0.505=0.1*V_2\\V_2=0.657 L`

The required volume is 0.657 L, or 657 mL