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primer dilution help - (Jul/16/2014 )



I have lyophilized primer at 80,000 pmol, MW= 6621.07. How to make 100uM with water?


I have done the following, please correct it:



I want 100uM = 100umol/L = 100pmol/ul


If 100pmol = 1ul, then 80,000pmol = x 

x = 800ul


I dissolve the lyophilized material in 800ul of water. Is this correct?