Bromophenol Blue is used as an indicator when titrating for soap.The ph range is from 3.0 to 4.6. 3.0 and under will turn yellow. 4.6 and above will be a dark blue. Click here if you need instructions for using hydrochloric acid and bromophenol blue in a soap titration for determining the amount of magnesol needed to dry-wash your biodiesel.
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