- #1

Hallucinogen

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## Homework Statement

This isn't homework, rather it's regular work. I have a >97% solution of 1-thioglycerol, the density of which is 1.25 g/mL. I am trying to get a 1.5 x 10-4 M solution at the end, and I suspect the instructions I have been given are incorrect.

Molar mass = 108.16

## Homework Equations

Concentration = Density / molar mass.

## The Attempt at a Solution

The molarity of my stock solution is (1.25 * 1000) = 1250 g/L. 1250 / 108.16 = 11.5 M.

I am instructed to make a 10-fold dilution, giving me a molarity of 1.15 M.

I should then take 6.5 microlitres and add this to a final volume of 100 millilitres.

But 1.15 x (6.5 x 10^-6) = 7.5 x 10^-6. Divided by (100 x 10^-3) = 7.5 x 10^-5 M, which is half the concentration I need?

Thanks, Adam.