
 Posts: 16
 Joined: Mon May 09, 2016 5:20 pm
I am making a 10,000 ppm stock of 2CHLOROBIPHENYL
The 2CHLOROBIPHENYL is a crystalline powder and is >99% pure. I am treating the powder as if it is 100% 2CHLOROBIPHENYL
If I want a 10,000 ppm solution I was told to weigh out 0.5grams of the 2CHLOROBIPHENYL powder into a volumetric flask and fill the flask to 50 ml with methanol. a weight/volume measurement. This doesn't seem to account for the density of methanol being less than water though.
My question is would it more accurate to weigh out 0.5g of the 2CHLOROBIPHENYL into 49.5 grams of methanol? Total weight would be 50.0 grams, and the 2CHLOROBIPHENYL would be at a concentration of 10,000 ppm.
The 2CHLOROBIPHENYL is a crystalline powder and is >99% pure. I am treating the powder as if it is 100% 2CHLOROBIPHENYL
If I want a 10,000 ppm solution I was told to weigh out 0.5grams of the 2CHLOROBIPHENYL powder into a volumetric flask and fill the flask to 50 ml with methanol. a weight/volume measurement. This doesn't seem to account for the density of methanol being less than water though.
My question is would it more accurate to weigh out 0.5g of the 2CHLOROBIPHENYL into 49.5 grams of methanol? Total weight would be 50.0 grams, and the 2CHLOROBIPHENYL would be at a concentration of 10,000 ppm.