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# An element ‘X’ has valency of H. Write its formula for carbonate?

Last updated date: 09th Sep 2024
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Hint: The capability of an atom to associate with other same or different atoms to form a molecule is known as its valency. The number of bonds that an atom forms with other atoms is going to depend on the valency of the particular atom.

- In the question it is given that an ‘X’ has valency of H.
- The valency of H means Hydrogen is 1 because hydrogen has only one electron in its electronic configuration in s orbital.
- The electronic configuration of Hydrogen is $1{{s}^{1}}$ .
- Means element ‘X’ also has a valency of one as per the given question.
- The molecular formula of carbonate ion is $CO_{3}^{2-}$ .
- We can see clearly that the carbonate has a charge of -2 in its molecular formula.
- Therefore carbonate ion reacts with 2 moles of ‘X’ and forms the product as shown in the below equation.
$CO_{3}^{2-}+2X\to {{X}_{2}}C{{O}_{3}}$
- Because ‘X’ has a valency of one the above reaction is possible.

- The chemical formula of ‘X’ with carbonate is ${{X}_{2}}C{{O}_{3}}$ .

Note: Carbonate radical combines easily with two hydrogen ions and forms carbonic acid. We can represent the carbonate radical as $CO_{3}^{2-}$ . The reaction of carbonate ion $CO_{3}^{2-}$ with two hydrogens ions as follows. $CO_{3}^{2-}+2{{H}^{+}}\to \underset{Carbonic\text{ }acid}{\mathop{{{H}_{2}}C{{O}_{3}}}}\,$