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Thread: How is Hydrogen Cyanide bonded?

  1. #1 How is Hydrogen Cyanide bonded? 
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    Is it bonded ionically or covalently?

    Its name 'Hydrogen Cyanide' follows the naming conventions of an ionic compound.
    Cyanide is a polyatomic ion of CN-. This would allow it form an ionic bond with a hydrogen cation.

    However, they are both non-metals, thus cannot be bonded ionically. If it is bonded covalently, why is it named in such a way?

    Thankyou


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    Bullshit Intolerant PhDemon's Avatar
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    There is some ionic character, when dissolved in water HCN will partially dissociate into H+ and CN-. In the gas phase it is a molecule with the C atom in the middle with a single bond to the H and a triple bond to the N.


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    Forum Professor Zwolver's Avatar
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    Is HCl covalently bound or ionically?

    It depends on if it forms ions when dissolved in water. (or when melted/vaporised)

    And HCl splits into 2 parts when in water.

    HCN basically does the same.

    Not sure what the exact rule is for this to be called ionic, but i think this covers most of the issues.
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    Thank you for the quick responses. They answered my question without any issues.
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  6. #5  
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    Quote Originally Posted by Zwolver View Post
    Is HCl covalently bound or ionically?

    It depends on if it forms ions when dissolved in water. (or when melted/vaporised)

    And HCl splits into 2 parts when in water.

    HCN basically does the same.
    No. There is a big difference in the pKa for HCl and HCN. HCN has a pKa of 9.21 (compared to 7.0 for HCl) so it is essentially covalent in aqueous solution.
    There are no paradoxes in relativity, just people's misunderstandings of it.
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    This is why I said "some ionic character" and "partially disscociate" but I couldn't be bothered to look up the numbers
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