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Now you could make up serial dilutions like a pro.

If only people would tell you what the dilutions ought to be...

But they never do that, do they?

How much do you need to dilute these stock solutions to make what's been asked for?

It's really simple.

1 mL of the stock solution = x mL of the requested working solution

so:

1 mL (2.5 molar pthalate) = x mL (0.5 mM pthalate)

You will need to get them in the same units.

1 mL (2500 mM pthalate) = x mL (0.5 mM pthalate)

Now solve for x:

x = 1 mL (2500 mM pthalate)/0.5 mM pthalate =5000 mL

You will have to dilute the stock solution of pthalate by 1:5000.