ChatterBank6 mins ago
Among the halides F,Cl,Br and I, Flourine is considered to be the most electronegative. So, considering the solutions; HF(aq) and HCl(aq), which is more acidic and why?
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Electronegativity of course is greatest among the elements on the far right of the periodic table than the alkaline and alkaline earth metals on the far left. it is a periodic property which increases across the period but decreases down the group. For a solution of aqueous hydrogen fluoride, because fluorine is more electronegative than Cl, so in the bond formation with its hydrogen atom, it pulls the hydrogen closer soo much to itself that the atomic radius is very very small. the inability of hydrogen to break free and dissociate in the water to bring about acidity causes a solution of HF(aq) to be less acidic...but in the case of HCl(aq) Cl has an electronegativity which is less, as compared to F, hence although it forms a covalent bond with hydrogen, it is able to release hydrogen in aqueous solutions to bring about free mobile electrons for acidity.the bond or atomic radius is hence larger than in HF.
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