Piperazine, HN(C4H8)NH, is a diprotic weak base used as acorrosion inhibitor and an insecticide and has the followingproperties: pKb1=4.22pKb2=8.67 For writing the reactions of thisbase in water, it can be helpful to abbreviate the formula as Pip:Pip+H2OPipH++H2O⇌⇌PipH++OH−PipH22++OH− The piperazine usedcommercially is a hexahydrate with the formula C4H10N2⋅6H2O.
Show the titration curve by plotting the following points:
• the initial pH of the solution. (pH=11.23)
• the pH at the 25% neutralization point of the firstneutralization (pH=10.26)
• the pH at the 50%neutralization point of the firstneutralization. (pH=9.78)
• the pH at the 75% neutralization point of the firstneutralization. (pH=9.30)
• the pH at the first equivalence point (pH=7.56)
• the pH at the 25% -neutralization point of the secondneutralization. (pH=5.81)
• the pH at the 50% -neutralization point of the secondneutralization. (pH=5.33)
• the pH at the 75% -neutralization point of the secondneutralization. (pH=4.85)
• the pH at the second equivalence point.(pH=3.35)
Be sure to plot all nine points. (Find the HCl volumesof the pH's in mL. Also plot points on graph.)
