I have 100mM EDTA, and I need to dilute it to 0.5M EDTA. How do I do that?

Question

I have 100mM EDTA, and I need to dilute it to 0.5M EDTA. How do I do that?

Answer 1

sorry but one cannot dilute UP that is one cannot make a more concentrated solution from a less concentrated solution by dilution.

0.5 M = 500 mM so it is 5X more concentrated than your "starting " concentration. Check the question again and be sure the numbers are correct

Answer 2

As other have said, this is impossible as written. However, I'll assume that rather than giving us an impossible problem you have made a mistake. The most likely mistake is the target concentration; could you mean 0.5 mM? In this case you need to dilute 200-fold from 100 mM to get to 0.5 mM. You could take 1 ml of your stock solution and make it up to 200 ml (i.e. add 199 ml) with water.

Answer 3

You can't!

0.5 M EDTA is the same thing as 500 mM EDTA. You can't dilute 100mM to 500!!!