Diluting an 18 wt% solution to 2 wt% using C1V1=C2V2

[flatpro]

Hey,

I have a solution of 18 wt % (about 1g/ml) I want to make it into a solution of 2 wt % by diluting it with water. Using C1 V1 = C2 V2 could someone show me how to do it. I have tried but seem to be getting muddled somewhere.

Thanks!

 

[Borek]

You need to know (or assume) initial (or final) volume.

Show what you did, we will start from there.

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[flatpro]

Final desired volume 10ml

18% of 1g = 180mgC1 V1 = C2 V2
(180mg/ml)(X) = (2mg/ml) (10ml)
X = 2 (10) / 189
X = 0.11 ml <--- which seems too low

 

[Borek]

Why 2 mg/mL?

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[flatpro]

I mean 2 wt percentage of the final solution

 

[Borek]

Perhaps that's what you mean, but does 2 mg/mL equal 2%?

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methods