part per million conversions

Question

part per million conversions

Mikey2 (Materials)

(OP)

8 Nov 06 16:23

Hey guys... quick question

I need to dilute my chemical into parts per million. But of course the only way to order it is (48 wt%, in water 99.9%)... 100ml bottle

Is there anything tricky in the conversion or can i just go about it as if it was 100%

if 100%, i could just do 1ml into 999ml water, stir, then put 1ml of that solution into 999ml of more water. That would give me 1 ppm right?

So if 48 wt%, could i go about it the same way...
48/100 * 1/500 * 1/1000 = 0.00000096 which is almost 1 ppm

Theoretically, would that still work? I know i can do it on a smaller scale, but i'm just not sure if my conversion still works.

Thanks guys
-Mikey

kenvlach (Materials) · Answer 1 · 2006-11-09 02:39:04

No, that's not very accurate -- it assumes that the solution density is the same as water, 1 g/ml.

You also need the density of the 48 wt% solution. The maxium density limit is 48 grams solid ideally dissolved in 52 grams water having a density (48 + 52)/52 = 1.923 g/ml. So, dissolved solid = 0.923 g/ml. Then, to get 1 Liter of 1000 ppm solution, want 1 gram dissolved solids so use 1/0.923 = 1.083 ml, diluted to 1 Liter.

The density of the solution may be available from the MSDS, product bulletin, CRC Handbook of Chemistry & Physics.

Mikey2 (Materials) · Answer 2 · 2006-11-09 21:03:54

Thanks Kenvlach,

I'm pretty sure i figured it out. Thanks

-Mikey

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part per million conversions