As you have hydrophilic conditions, you'll probably be better off with the
salt. As CR is a pretty old compound, you might find some solubility data in
the Beilstein or the CRC handbook of organic chemicals, Or simply, check
Sigma (they should sell it) online for a data sheet and solubility data.
Please tell us
a) what makes Cresol red so interesting (never heard about it, but I am
b) if there is a reference
c) How you dissolved it in the end!
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