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To obtain 500 ml of 50 mM Piperazine buffer (pKa 5.55)

Dissolve 2.1535 g free acid in about 400 ml of pure water
Titrate with 1 M NaOH to pH 5.8 at 25¡ãC
Make up volume to 500 ml

ATTENTION
Be aware that the pH will change with temparature , buffer additives,...
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