Which phenol red solution should be used in method 10076 for photometric determination of pH?

Document ID

Document ID TE7449

Published Date

Published Date 06/06/2019
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Question
Which phenol red solution should be used in method 10076 for photometric determination of pH?
Summary
Phenol red for colorimetric determination of pH
Answer
The phenol red indicator solution that should be used in method 10076 for photometric determination of pH is Phenol Red Indicator Solution, Spec. Grade, 50 mL (Product #2657512). This phenol red indicator solution is spec grade and is a high quality designed for use in photometric tests. The chemical form for this solution is C 19H 14O 5S.

Alternative Phenol Red Indicator Solution, 100 mL MDB and 500 mL (Product # 21132 and 21149) are a different chemical form (C 19H 13NaO 5S) and may not work well for pH determination using a photometer.

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