How can I make this potassium phosphate buffer pH7.4?

21 January 2020 0 5K Report

[100 mm KH2PO4, 1 mm dithiothre- itol (DTT) and 1 mm ethylenediaminetetraacetic acid (EDTA), pH 7.4]

I have so far only managed to make it at pH 6.7.

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