Question

Four species are listed below

(i)HCO3- (ii)H3O+

(iii)HSO4- (iv) HSO3F

Which one of the following is the correct sequence of their acid strength?

Answer 1

you can compare acidic strength as giving out a proton..that would create +ive charge to the atom and if the positive charge is more on the central atom the possibility of giving out the positive charge will be less..

Answer 2

It would create a negative charge :)
CO3(2-)
H2O
SO4(2-)
SO3F(-)
These are very random options to compare ,
what should i keep in mind while comparing ?
number of resonating strucures , no charge on the specie ??

Answer 3

yeah negative...
lets start from scratch
acidic strength is about giving out H+ or receiving the e- so
more the positive charge on the central atom easier will be the trap of e-
that means higher OS of any specie is more acidic