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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: strokebow on October 14, 2013, 08:42:06 AM

Title: ppm by volume
Post by: strokebow on October 14, 2013, 08:42:06 AM

I am struggling with the ambiguity surrounding ppm measurements.

If I have a bottle of say concentrated benzene how would I make a 100ppm solution?

For water, 100mg = 0.1mL. And 100ppm = 100mg/L. Therefore, would I mix 0.1mL of Benzene with 1L of water.


Please help,

thanks

Title: Re: ppm by volume
Post by: Hunter2 on October 14, 2013, 08:59:44 AM

Benzene is not soluble in water. But nevertheless.
The ppm value is better to calculate for the mass. Convert the volume to mass. Benzene has its own specific gravity=  0.88 g/ml

So if you disslove 100 mg = 113,6 µl  in 1 kg water, then its 100 ppm.