# What fraction of piperazine (perhydro-1,4-diazine) is in each of its three forms (H2A, HA-, A2−) at...

###### Question:

What fraction of piperazine (perhydro-1,4-diazine) is in each of its three forms (H2A, HA-, A2−) at pH 6.50? The acid dissociation constant values for piperazine are ?a1=4.65×10−6 and ?a2=1.86×10−10.

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