Question- piperazine hnc4h8nh is a diprotic weak base used, Ask an Expert

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Question- Piperazine, HN(C4H8)NH, is a diprotic weak base used as a corrosion inhibitor and an insecticide and has the following properties-
pKb1=4.22pKb2=8.67

For writing the reactions of this base in water, it can be helpful to abbreviate the formula as Pip-

Pip+H2OPipH++H2O??PipH++OH?PipH22++OH?

The piperazine used commercially is a hexahydrate with the formula C4H10N2?6H2O.

A 1.00-g sample of piperazine hexahydrate is dissolved in enough water to produce 100.0 mL of solution and is titrated with 0.500 M HCl.

What is the pH at the second equivalence point?

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