Isoelectric point of alanine is 6.0 while ionization constant of COOH of alanine is 5.0×10−3. Find the pH at which concentrations of the given species are same. [log 5 = 0.7]
Open in App
Solution
Given, Ka1=5.0×10−3 So, pKa1=−log(Ka1)=2.3 Isoelectric point, pI=pKa1+pKa22⇒6.0=2.3+pKa22⇒pKa2=9.7 When concentration of both species are same then pKa2 will be equal to pH.