What is the Difference Between Zwitterion and Dipole?

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The main difference between a zwitterion and a dipole lies in the distribution of electric charges within the molecule and the nature of the charges involved.

  • Zwitterion: A zwitterion is a neutral molecule that contains an equal number of positively and negatively charged functional groups, resulting in a net charge of zero. Zwitterions are sometimes referred to as "inner salts". Examples of zwitterions include amino acids, which have both a positive amine group and a negative carboxylate group. Zwitterions have an isoelectric point (pI), which is the pH value at which the charge in the molecules is neutral.
  • Dipole: A dipole refers to the presence of positive and negative charged ends, or north and south magnetic poles, within a molecule or system. However, a dipole does not necessarily carry charges but has differences in electric potential at different positions. Dipolar compounds are not classified as zwitterions.

In summary, a zwitterion is a neutral molecule with equal numbers of positive and negative charges, while a dipole refers to the presence of positive and negative charged ends or differences in electric potential within a molecule or system.

Comparative Table: Zwitterion vs Dipole

The main difference between a zwitterion and a dipole lies in their charges and molecular structure. Here is a table comparing the two:

Property Zwitterion Dipole
Definition A zwitterion is a neutral molecule containing an equal number of positive and negative charged functional groups, resulting in a net formal charge of zero. A dipole refers to the presence of positive and negative charged ends or north and south magnetic poles in a molecule or system.
Charge Contains both positive and negative charges in the same molecule, but the net charge is zero. Does not necessarily carry charges, but has differences in electric potential or magnetic poles.
Examples Amino acids, sulfamic acid molecules, anthranilic acid. Electric fields, magnetic fields.
Common Forms Zwitterions are commonly found in amino acids, which have both a positive ammonium or amino group and a negative carboxylate group. Dipoles are present in various molecules and systems, such as electric fields and magnetic fields.

In summary, a zwitterion is a neutral molecule with both positive and negative charges, while a dipole refers to the presence of positive and negative charged ends or magnetic poles. Zwitterions are commonly found in amino acids, while dipoles are present in various molecules and systems.