Kind of embarrassing post. I'm trying to make a 10uM retinoic acid (from Sigma) http://www.sigmaaldr.../1/r2625pis.pdf
But suck on the calculations. It says "A stock solution of 0.01 M (3 mg/ml) RA in absolute ethanol was stored at -70°C for up to two weeks." I dissolve 3mg of R.A. in 1 mL of 200 proof ethanol, and then take 5 uL of that mixture and add it to 5mL of media. Are my steps correct?