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H3PO4, which contains three hydrogen atoms per molecule, is a weak acid, whereas HCL, which contains only one hydrogen atom per molecule, is a strong acid. Explain why?

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Aliahmadiidn
Because based on atomic structure, in hydrogen chloride chlorine has more
tendency to gain electron of hydrogen and produce H+ and if hydrogens in phosphoric acid give their electrons to oxygens, there will be repulsion among non-joint electrons pair. Also that is why H3PO4 has acid ionization constant [tex] K_{a} = 7.25*10^{-3}[/tex] and HCl [tex]K_{a}=10^{3}[/tex].
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