Four species are listed below : (i) HCO3^– (ii) H3O^+
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?
(a) iii < i < iv < ii
(b) iv < ii < iii < i
(c) ii < iii < i < iv
(d) i < iii < ii < iv
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(d) : HSO3 F is the super acid. Its acidic strength is greater than any given species. The pKa value of other species are given below :
HCO3– →10.25
H3 O+ → –1.74
HSO4– → 1.92
Lesser the pKa value, higher will be its acidic strength. Hence sequence of acidic strength will be
HSO3F > H3O+ > HSO4– > HCO3–
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