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  • Four species are listed below : <img alt="(i)\; HCO^{-}_{3}\; \; \; \; \; \; \; \; \; \; \; (ii)\; H_{3}O^{+}" src="https://learn.careers360.com/latex-image/?%28i%29%5C%3B%20HCO%5E%7B-%7D

Four species are listed below :

(i)\; HCO^{-}_{3}\; \; \; \; \; \; \; \; \; \; \; (ii)\; H_{3}O^{+}

(iii)\; HSO^{-}_{4}\; \; \; \; \; \; \; \; \; (iv)\; HSO_{3}F

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

Option: 1

iii < i < iv < ii


Option: 2

iv < ii < iii < i


Option: 3

ii < iii < i < iv


Option: 4

i < iii < ii < iv


Answers (1)

best_answer

HSO_{3}F is the super acid. Its acidic strength is greater than any given species. The  pK_{a}   value of other species are given below :

HCO^{-}_{3}\; \; \rightarrow\; \; 10.25

H_{3}O^{+}\; \; \rightarrow\; \; -1.74

HSO^{-}_{4}\; \; \rightarrow\; \; 1.92

Lesser the pK_{a} value, higher will be its acidic strength. Hence sequence of acidic strength will be

HSO_{3}F> H_{3}O^{+}> HSO^{-}_{4}> HCO_{3}^{-}

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