[CopperSmurf]

I'm bad at ppm calculations and I just want some confirmation that I'm doing this right:

I have this solution in g/mL
so to convert to ppm, can I follow these steps? (I made it up)

1)  X g/mL * (1000 mL/L) = 1000X g/L
2)  1000X g/L * (1000 mg/g ) = 1000000X mg/L = 1000000X ppm
1 mg/L = 1 ppm since it is a very dilute aqueous solution
(mostly water and water has density 1 g/mL )

[Borek]

1 mg/L = 1 ppm since it is a very dilute aqueous solution
(mostly water and water has density 1 g/mL )

OK with me, just don't forget about this density approximation.

[CopperSmurf]

awesome, thanks. I won't forget about the density approximation, ever! I've made that mistake several times, years ago.

[sweet_question]

1 mg/L = 1 ppm since it is a very dilute aqueous solution
(mostly water and water has density 1 g/mL )

OK with me, just don't forget about this density approximation.

I was just thinking !!
If we use solvent other than water having different density than will equation remain same
1ppm = 1mg/L

[Borek]

Not necesarilly. ppm can be ppm mass per mass, volume per volume, mass per volume or even atoms per atoms. Usually it is mass per mass and for water solutions we use approximation 1L = 1kg, that makes 1mg/1L = 1mg/1kg = 1 ppm. But in the case of other solvents it doesn't have to be true.

[sweet_question]

I make 1000ppm solution of methyl salicylate (Mw = 152.1494 g/mol) in solution of Ethylene glycol diacetate (density 1.128) by adding 10ml of solution  into 10mg of MeS. Is this correct ??

Not necesarilly. ppm can be ppm mass per mass, volume per volume, mass per volume or even atoms per atoms. Usually it is mass per mass and for water solutions we use approximation 1L = 1kg, that makes 1mg/1L = 1mg/1kg = 1 ppm. But in the case of other solvents it doesn't have to be true.

[Borek]

Try to calculate. You already know the mass of MeS. What is mass of solvent? Total mass of solution?

[sweet_question]

Try to calculate. You already know the mass of MeS. What is mass of solvent? Total mass of solution?

Well that is V/V 1000ppm * 1.128 g/ml = 1128 microgm

[Borek]

Sorry, no idea what you did.

Follow questions I have asked.