Question

ti3+ salts are coloured. whereas ti4+ salts are white.why?

Answer 1

Transition metal ions have completely empty d orbitals.
So ti4+ salts are colourless.

Answer 2

Due to the difference in the number of electrons present in d-orbitals, $Ti^{3+}$ salts are colored whereas $Ti^{4+}$ salts are white.

Explanation:

• The ions such as $Ti^{3+}$ and $Ti^{4+}$ are different ions formed by Titanium which is an transition element and belongs to the d-block of the periodic table.
• All transition metal exhibits d-d transitions due to the presence of electrons in their d-orbitals.
• The electronic configuration for $Ti^{3+}$ and $Ti^{4+}$ ions are as follows:

$Ti^{3+}$ - $3d^14s^0$

$Ti^{4+}$ - $3p^63d^04s^0$

• As the d-orbital of $Ti^{4+}$ is not having any electron, it is white in color whereas due to the presence of 1 electron in the d-orbital of $Ti^{3+}$ it is colored.

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