or
PIPES Sesquisodium Salt Piperazine-NN-bis(2-ethanesulfonic acid) sodium salt. CAS RN 100037-69-2. Formula Weight: 335.37. OmniPur 99.0% min. DNase RNase Protease: None detected. Heavy metals (as Pb): 1 ppm max. pKa at 25[degree]C: 6.10-7.50. 1kg.