# Slight Unintended Glycerin Rivers : An Error in Thinking, and how I solved it.

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#### MichaelP

Supporting Member
Hi All,

I wanted to post this in case somebody who is using a master batch of NaOH and converting it to a desired concentration doesn't make the same mistake that I did.

I've spared you all the how I went back and recalculated, but if anyone is interested I will post how I came to the correct usage of my master batch and water to get a true 33% solution of NaOH. Happy Soaping everyone!!!

That's interesting, Michael, since (a) I have always used weight over volume unless told otherwise since it has been beaten over my head early on as a baker, and subsequently in soapmaking and (b) that is a pretty big difference (30% v. 33%) in some instances, especially if you are not aware of it (I certainly wasn't). Although I guess if we all *mean* 30% when we say 33% - ie; most/all of us use weight over volume, which I think might be the case? - then it sort of works out in the end. Hm. I for one will forgo the actual math since it might make me cry .

@not_ally, In this case, it's my fault for using a formula (C1V1=C2V2) that is specifically meant for concentrations and volumes when trying to convert my 50% master batch solution to a 33% solution and not using volume but weight!

@dmcgee5034, Ah! I didn't know that feature was available on that calculator! Seems I will be using a new soap calculator! Thank you for that!!

Yep, basically C1V1=C2V2 is for dilute aqueous solutions only. A 50% NaOH isn't a "dilute" solution anymore. Good save!

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