Asked by Chimcy
                For the series of oxoacids H3PO4 , H2SO4 , and HClO4 , which acid is strongest? Why?
            
            
        Answers
                    Answered by
            DrBob222
            
    The relative strength is determined by (a) the electronegativity of the central atom and (b) by the number of oxygen atoms. Here is a good description. For this series HClO4 is the strongest followed by H2SO4 followed by H3PO4.
https://chem.libretexts.org/Bookshelves/Inorganic_Chemistry/Map%3A_Inorganic_Chemistry_(Miessler_Fischer_Tarr)/6%3A_Acid-Base_and_Donor-Acceptor_Chemistry/6.3%3A_Br%C3%B8nsted-Lowry_Concept/6.3.2_Br%C3%B8nsted-Lowry_Superacids_and_the_Hammett_Acidity_Function/6.3.3_Thermodynamics_of_Solution-Phase_Br%C3%B8nsted_Acidity_and_Basicity/6.3.4_Thermodynamics_of_Gas_Phase_Br%C3%B8nsted_Acidity_and_Basicity/6.3.5._Non-nucleophilic_Br%C3%B8nsted-Lowry_Superbases/6.3.6._Rules_of_Thumb_for_thinking_about_the_relationship_between_Molecular_Structure_and_Br%C3%B8nsted_Acidity_and_Basicity*/6.3.7.__The_acid-base_behavior_of_binary_element_hydrides_is_determined_primarily_by_the_element's_electronegativity_and_secondarily_by_the_element-hydrogen_bond_strength.*/6.3.8._The_Acidity_of_an_Oxoacid_is_Determined_by_the_Electronegativity_and_Oxidation_State_of_the_Oxoacid's_Central_Atom*
    
https://chem.libretexts.org/Bookshelves/Inorganic_Chemistry/Map%3A_Inorganic_Chemistry_(Miessler_Fischer_Tarr)/6%3A_Acid-Base_and_Donor-Acceptor_Chemistry/6.3%3A_Br%C3%B8nsted-Lowry_Concept/6.3.2_Br%C3%B8nsted-Lowry_Superacids_and_the_Hammett_Acidity_Function/6.3.3_Thermodynamics_of_Solution-Phase_Br%C3%B8nsted_Acidity_and_Basicity/6.3.4_Thermodynamics_of_Gas_Phase_Br%C3%B8nsted_Acidity_and_Basicity/6.3.5._Non-nucleophilic_Br%C3%B8nsted-Lowry_Superbases/6.3.6._Rules_of_Thumb_for_thinking_about_the_relationship_between_Molecular_Structure_and_Br%C3%B8nsted_Acidity_and_Basicity*/6.3.7.__The_acid-base_behavior_of_binary_element_hydrides_is_determined_primarily_by_the_element's_electronegativity_and_secondarily_by_the_element-hydrogen_bond_strength.*/6.3.8._The_Acidity_of_an_Oxoacid_is_Determined_by_the_Electronegativity_and_Oxidation_State_of_the_Oxoacid's_Central_Atom*
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