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Why does the molecule have net positive charge? enter image description here

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    $\begingroup$ Because the particles before the formation of the said bond had a net charge. $\endgroup$ Jul 13, 2018 at 13:13
  • $\begingroup$ why not negative charge then? $\endgroup$
    – quantised
    Jul 13, 2018 at 14:17
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    $\begingroup$ Because they never had negative charge in the first place. $\endgroup$ Jul 13, 2018 at 14:38
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    $\begingroup$ No, this is not because of coordinate bond. The charge is conserved no matter what. Coordinate bonds are irrelevant here, as well as bonds of any other type. $\endgroup$ Jul 13, 2018 at 15:51
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    $\begingroup$ @IvanNeretin I have feeling this is hopeless case here... $\endgroup$
    – Mithoron
    Jul 13, 2018 at 16:25

2 Answers 2

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Consider the formation of the given hydronium ion: $\ce{H2O + H+ -> H3O+}$ (also more correctly stated as the auto-ionization of water: $\ce{2H2O -> H3O+ + OH-}$)

The positive charge you're seeing indeed belongs to the whole molecule, as any reaction conserves charge both on the left and right side of the arrow.

However, this is not true in general. If a neutral molecule itself forms from neutral atoms, which involves a coordinate bond, then the molecule won't be charged.

Although, do note that the distinction between normal covalent bond and coordinate covalent bonds is artificial.

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The charges are produced only due to the nearness of the electrons with the nucleus of the respective atom. Here the co-ordinate bonds produces charge because the electrons in this case is near the H atom which results in a partial positive charge on H that's why there is a charge overall in the compound.

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