Assume 2 percent solution and need .12 percent -- how much water per oz?

[last426]

Is there a formula for this (must be)? Thanks, Kim.

[Vainglory, Esq.]

This might help, though I'm not sure if you'll be using a micropipettor...

http://www.ruf.rice.edu/~bioslabs/methods/solutions/dilutions.html

[Dans 68]

It has been a while since my water quality classes, but all you need to do is divide your solution by what you want. 2% divided by 0.12% = 16.67. So one fluid ounce of the 2% solution added to 16.67 fluid ounces of water will yield your 0.12 % solution.

Dan

[last426]

Thanks Dan.  That's what I get for buying mouthwash in undiluted bulk (but it was a good deal).  Kim