Question

Calculate the amount 0.5 M EDTA solution (MW= 292.24 g/mol) required to make 400 mL of 70.0 mM solution?

Answer 1

To solve this answer we will have to use dilution equation which is given by:

M₁V₁ = M₂V₂

where, M₁ is initial molarity of the solution

M₂ is final molarity of the solution

V₁ is initial volume of the solution

V₂ is final volume of the solution

We have been given M₁, M₂ and V₂ in the question. Our aim is to find V₁.

Substituting the values from the question in the above dilution equation we get,

0.5 V₁ = 0.07 400 (Here units on LHS are same as units on RHS, so you need not convert mL into litres)

V₁ = (0.07 400)/0.5

V₁ = 56 mL

So to make 400 mL of 70 mM EDTA solution, you need to take 56 mL of 0.5 M EDTA solution and dilute it to 400 mL using water.