The equilibrium constants for amino acids are given in terms of succesive ionization constants of the protonated form.For example, equilibrium constat
The equilibrium constants for amino acids are given in terms of succesive ionization constants of the protonated form.For example, equilibrium constats for Glycine `(NH_2CH_2COOH)` are `K_(a1)=5xx10^(-3) M and K_(a2)=2xx10^(-10)M`.What will be the pH at the Isoelectric point for this amino acid and pH of 0.02 M protonated Glycine in pure water respectively ?[Take :log 2=0.30]
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Correct Answer - 62
Isoelectric point pH =`1/2[pKa_(1)+pKa_(2)]=1/2[2.3+9.7]=6`
`[H^+]=sqrt(5xx10^(-3)Mxx0.2)=sqrt(10xx10^(-5))=10^(-2)`
pH=-log `[H^+]=2`
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