How much sodium phosphate dibasic is needed for pH adjustment from pH 5 to pH 7.4?

Stig Hill Christiansen @Stig-Hill-Christiansen

06 July 2023 0 5K Report

I have 40 L of water that I want to adjust from pH 5 to pH 7.4, and I want to calculate how much Na2HPO4 (sodium phosphate dibasic, 141.96 g/mol) I need for such pH adjustment. How can I calculate this correctly? I have tried using the Henderson-Hasselbalch equation, but I don't trust my calculations. Any help would be much appreciated.

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