[georgiec85]

Hi guys, Iv recently started a Biological science based PhD and my chemisty skills need improving.

Im currently struggling to convert ng/ml into micromoles.

I need to convert Insulin (mW 5808) 3.5ng/ml into micromoles.

Can anyone help?

Thanks in advance

Georgie

[nj_bartel]

http://physics.nist.gov/cuu/Units/prefixes.html

http://alysion.org/dimensional/fun.htm

You just need to know the prefixes from link one.  Read link 2.

However, to solve that problem I believe you need the density of insulin.  -Never mind, misread the units in the problem.  You were given the density, sorry-

[Borek]

Honestly, this is HS problem but I won't move the question as it would be a cruel joke.

3.5 ng - how many moles? In general - how do you convert mass to moles?

No need for density.

Micromoles doesn't sound like reasonable units, something like picomoles will be more adequate.

[nj_bartel]

Oops, you're right; that initial comment came from thinking it just said 3.5 mL insulin.

[georgiec85]

This is my first post, so I apologise if Iv posted in the wrong place.

Basically I have a stock concentration on insulin (3.5ng/ml) and I need to use 100micromoles for an experiment. In order to work out the dilution factor, I need to do the conversion.

Thanks for your replies. Im in the process of brushing up on my chemistry knowledge, but this is quite urgent.

Georgie

[Borek]

Basically I have a stock concentration on insulin (3.5ng/ml) and I need to use 100micromoles for an experiment. In order to work out the dilution factor, I need to do the conversion.

So you need 166 cubic meters of the solution. It is a small pool. Are you sure?

100x10^-6 mole (or 10^-4 mole) times molar mass gives you mass of the insulin. Divide that by 3.5x10^-9 to get number of mililiters of solution.