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Electrical Properties of Colloids

Alanine, at i...

Question

Alanine, at its isoelectric point, exists in solution as :

\begin{matrix} H_{2} N C H C O O^{⊖} | C H_{3} \end{matrix}

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\begin{matrix} H_{3} \oplus N C H C O O H | C H_{3} \end{matrix}

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\begin{matrix} H_{3} \oplus N C H C O O^{⊖} | C H_{3} \end{matrix}

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\begin{matrix} H_{2} N C H C O O H | C H_{3} \end{matrix}

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Solution

The correct option is C $\begin{matrix} H_{3} \oplus N C H C O O^{⊖} | C H_{3} \end{matrix}$
The isoelectronic point or isoionic point is the pH at which the amino acid does not migrate in an electric field. This means it is the pH at which the amino acid is neutral, i.e. the zwitterion form is dominant.
So Alanine exits as given in the figure.

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Similar questions

C H^{3 +}

H_{3}^{+}

N H_{3}

C H_{3}^{-}

{C H}_{3}^{+}

H_{3} O^{+}

{N H}_{3}

{C H}_{3}^{-}

({C H}_{3})_{3} + C

{C H}_{3} + C H_{2}

+ C H_{3}

{C H}_{3} C O O H + H_{2} O ⇌ {C H}_{3} {C O O}^{-} + H_{3} O^{+}

1.8 \times 10^{- 5}

{C H}_{3} C O O H + {O H}^{-} ⇌ {C H}_{3} {C O O}^{-} + H_{2} O

C H_{3} - N H_{2}

C H_{3} - N H - C H_{3}

C H_{3} - N | C H_{3} - C H_{3}

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