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Piperazine, HN(C4H8)NH, is a diprotic weak base used as a corrosion inhibitor and an insecticide and...

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Chemistry

Piperazine, HN(C4H8)NH, is a diprotic weak base used as acorrosion inhibitor and an insecticide and has the followingproperties:

pKb1=4.22 pKb2=8.67

For writing the reactions of this base in water, it can behelpful to abbreviate the formula as Pip:

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

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

a. Calculate the pH after 2.575mL of HCl have been added.

b. Calculate the pH when 12.875mL of HCl has been added.

c. What is the pH at the first midway point?

please don't copy and paste that yahoo answers bs, it doesn'tgive the right answer.

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