Structures of alanine at pH = 2 and pH = 10 a | vedclass

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Question

(A) Alanine is an amino acid with the structure $CH_3-CH(NH_2)-COOH$. $1$. At low $pH$ ($pH = 2$,acidic medium),the basic amino group $(-NH_2)$ accept

Vedclass · Accepted Answer

$CH_3-CH(N^{+}H_3)-COOH$ and $CH_3-CH(NH_2)-COO^{-}$

Vedclass · Answer

(A) Alanine is an amino acid with the structure $CH_3-CH(NH_2)-COOH$. $1$. At low $pH$ ($pH = 2$,acidic medium),the basic amino group $(-NH_2)$ accepts a proton to form a cation: $CH_3-CH(N^{+}H_3)-COOH$. $2$. At high $pH$ ($pH = 10$,basic medium),the acidic carboxylic group $(-COOH)$ loses a proton to form an anion: $CH_3-CH(NH_2)-COO^{-}$.

Structures of alanine at $pH = 2$ and $pH = 10$ are respectively

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