bond strength

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bond strength

Postby annikaying » Fri Dec 06, 2019 10:27 am

What factors affect the bond strength of an acid when going down a group?

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Re: bond strength

Postby madijohnson_4A » Fri Dec 06, 2019 10:33 am

As you go down a row, the bond becomes longer and therefore weaker than the bonds with elements above it. The longer bonds are due to larger nuclei, more core electrons shielding the valence electrons, and decreasing electronegativity. The longer the bond, the easier it is to break and dissociate in solution, so the stronger the acid. That's why HI, HBr, and HCl are strong acids, while HF is only a weak acid.

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Re: bond strength

Postby VPatankar_2L » Sat Dec 07, 2019 9:37 pm

You can compare the bond length of binary acids whose central atom varies down a group to determine which acid is stronger or weaker.

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