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=4.22pKb2=8.67 For writing the reactions of thisbase in water, it can be helpful to abbreviate the formula as Pip:Pip+H2OPipH++H2Oâ‡Œâ‡ŒPipH++OHâˆ’PipH22++OHâˆ’ The piperazine usedcommercially is a hexahydrate with the formula C4H10N2â‹…6H2O.
Show the titration curve by plotting the following points:
â€¢ the initial pH of the solution. (pH=11.23)
â€¢ the pH at the 25% neutralization point of the firstneutralization (pH=10.26)
â€¢ the pH at the 50%neutralization point of the firstneutralization. (pH=9.78)
â€¢ the pH at the 75% neutralization point of the firstneutralization. (pH=9.30)
â€¢ the pH at the first equivalence point (pH=7.56)
â€¢ the pH at the 25% -neutralization point of the secondneutralization. (pH=5.81)
â€¢ the pH at the 50% -neutralization point of the secondneutralization. (pH=5.33)
â€¢ the pH at the 75% -neutralization point of the secondneutralization. (pH=4.85)
â€¢ 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.)

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3.6 Ratings (385 Votes)

Given the pH of the weak base 1123 pOH 14 1123 277 OH 10277 170x103Since Kb2 is very small the OH concentration is mainly due tofirst dissociationFor weak base OH 170x103 underrootKb1 x C 603x105 xC 289x106 C 0050 MHence the concentration of Piperazine HNC4H8NH in See Answer

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