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Old Mar 8th 2018, 07:51 PM   #2
oz93666
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Join Date: May 2017
Location: thailand
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so ... you have a solution containing 1000ppm , that means for every million gms of solvent there are 1000 gms of X , so 1 liter contains 1gm


0.5gm powder ...

you want a million gms of this powder to have 500 gms of X

so 1 gm powder will have 0.5 milligrams of X

0.5 gm powder will have 0.25 milligrams that's 0.00025 gms

one cc of your solution contains 1 milligram X

A quarter of a cc (ml) 0.25 milligrams

you need to add one quarter of a cc of solution
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