A) Ethylenediamine(H 2 NCH 2 CH 2 NH 2 ) is adiprotic base (pK b1 =4.072, pK b2

Question

A) Ethylenediamine(H2NCH2CH2NH2) is adiprotic base (pKb1=4.072, pKb2=7.152)Calculate the isoelectric point of the base. B) A 25.0 mL sample of 0.227 M  Ethylenediamine istitrated with 0.107 M HCl. How many mLof HCl will be needed toreach equivalence point? How many mL of HCl will be needed toachieve the second equivalence point? C) What is the pH of the solution after 31.10 mL of HCl hasbeen added? A) Ethylenediamine(H2NCH2CH2NH2) is adiprotic base (pKb1=4.072, pKb2=7.152)Calculate the isoelectric point of the base. B) A 25.0 mL sample of 0.227 M  Ethylenediamine istitrated with 0.107 M HCl. How many mLof HCl will be needed toreach equivalence point? How many mL of HCl will be needed toachieve the second equivalence point? C) What is the pH of the solution after 31.10 mL of HCl hasbeen added?

Explanation / Answer

This looks like a problem from a take home exam if I had to guess,maybe Dr N's class? Anyway for the first one you can use theequation pI = 1/2 * (pk1 + pk2) where Pi is the isoelectricpoint.

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