Four species are listed below: (i) HCO_3^- (ii) H_3O^+ (iii)HSO_4^- (iv)HSO_3F Which one of the following is the correct sequence of their acid strength ?

Four species are listed below: (i) HCO_3^- (ii) H_3O^+ (iii)HSO_4^- (

1.	Four species are listed below: (i) HCO_3^- (ii) H_3O^+ (iii)HSO_4^- (iv)HSO_3F Which one of the following is the correct sequence of their acid strength ?
Answer» `iii LT I lt iv lt ii` `iv lt ii lt iii lt i` `ii lt iii lt I lt iv` `I lt iii lt ii lt iv ` Solution :`HSO_3F` is the super acid. Its ACIDIC strength is greater than any given SPECIES. The `pK_a` value of other species are given below: `HSO_3^(-) to` 10.25 `H_3O_(+) to` -1.74 `HSO_4^(-) to` 1.92 Lesser the `pK_a` value, higher will be its acidic strength. Hence SEQUENCE of acidic strength will be,`HSO_3F gt H_3O^(+) gt HSO_4^(-) gt HSO_3^(-)`