Which acids are weak acids; which are strong? HCl, HF, HI, H(ClO 4 ), H 2 O, HC

Question

Which acids are weak acids; which are strong?

HCl, HF, HI, H(ClO4), H2O, HC2H3O2

(I know who responds will say if it dissociates then it is strong vs weak, but I do not get this; I prefer a math example could someone do an example of how to figure out a way to do these mathematically maybe pKa? Even just showing one and I can figure out the rest... If you prefer to explain it the same way I have had tons others fail to get it to stick in my brain with the dissociation version, then perhaps you could actually say more than if it dissociates or not and give an example...)

I hope my request is not too picky, I just really need a version that I will be able to understand and apply to any acid. Thanks a bunch.

Explanation / Answer

for an acid like HF

HF + H2O--------> F- + H3O+

Ka = [F-] [H3O+]/ [HF]

higher value of Ka suggests lesss of HF at equilibrium. more of dissociation of HF. Hence Ka indicates the extent of dissoication. Higher value of Ka suggests strong acid and lowest Ka suggests less dissociation.

Ka data : HCl = 1.3*106, HF = 6.8*10-4, HI= 3.2*109, HClO4= 106, H2O= 2*10-16, CH3COOH= 1.8*10-5,

strong acids are HCl, HI, HClO4 weak acids are H2O, CH3COOH and HF.

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