Question

What is the initial pH of the solution, before any titrant isadded?

Info:

Piperazine,HN(C4H8)NH , a diprotic weak base has the followingproperties: pKb1 = 4.22, pKb2= 8.67

For writing the reactions of this base in water,abbreviate theformula as Pip:

Pip+H2O-->/<--PipH+OH-, PipH+ + H2O-->/<-- PipH2+ +OH-

The piperazine used commercially is a hexahydrate with the formulaC4H10N2 * 6H20.

A 1.00- g sample of piperazine hexahydrate is dissolved in enoughwater to produce 100.0 mL of solution and is titrated with 0.500 MHCl .