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Species acting as both Bronsted acid and base is

Monjur Alahi

Species acting as both Bronsted acid and base is
(a) (HSO4)–1 

(b) Na2CO3

(c) NH3 

(d) OH–1.


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Salim Ahmed Kawsar

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(a) : According to BronstedLowry concept, a Bronsted acid is a substance which can donate a proton to any other substance and a Bronsted base is a substance which can accept a proton from any other substance.
(HSO4 )– can accept and donate a proton.
(HSO4 )– + H+ → H2 SO4
(HSO4 )– – H+ → SO42–.

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