[omgwtfitsp]

I have a 1mg/L Lead solution that I want to dilute to 0.75, 0.50, and 0.25 mg/L. How much water do I need to add to get to these results? What is the formula?

This is how I thought of it. I want to make 100 mL of each concentration so for 0.75 mg/L I put 25 mL of water and 75 mg/L of the solution.

For 0.50 mg/L, I put 50 mL of water and 50 mL of the solution.

For 0.25 mg/L I put 75 mL of water and 25 mL of the solution.


Is this correct?

[AWK]

Yes,your attempt is correct.

[RandoFlyer]

If you use this formula it should help:

C₁V₁=C₂V₂

Where C₁ is the initial concentration, C₂ is the desired concentration, and V₂ is the desired volume.

Solving for V₁ will give the amount of the original solution to use.