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Hi Debbie,
If you want to have mass/volume units, and since you have already weighted the standard, you don't need to use the density. Your formula above will lead to a concentration of 9920 mcg/mL (if you keep 3 significant digits, which would in fact depend on the precision of the 5 mL measurement, but that would be the topic of another post).
You would use the density only if you want to convert back to volume/volume units, but that is less common. On the other hand, if weighing is not very convenient, you could measure an exact volume with a calibrated pipette, then using the density you can calculate to mass and go from there.
If you want to have mass/volume units, and since you have already weighted the standard, you don't need to use the density. Your formula above will lead to a concentration of 9920 mcg/mL (if you keep 3 significant digits, which would in fact depend on the precision of the 5 mL measurement, but that would be the topic of another post).
You would use the density only if you want to convert back to volume/volume units, but that is less common. On the other hand, if weighing is not very convenient, you could measure an exact volume with a calibrated pipette, then using the density you can calculate to mass and go from there.
Complete thread:
- Liquid Working Standard Debbie 2009-05-09 18:56
![[Mix]](https://static.bebac.at/img/mix.png "open in Mix view")
- Liquid Working StandardNewInPK 2009-05-13 01:32
Ing. Helmut Schütz