Posted by Helen on Wednesday, November 7, 2012 at 7:15pm.
You want to dilute it by a factor of .5/.15, or 3.33 times. So you need one part original, 2.33 parts water to dilute.
What is one part? 250/3.33=75ml
so you need 75 ml of the original solution. Add 75*2.33=175ml water, stir, and label.
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