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Equilibrium

Question
CBSEENCH11006512

Identify the acids and bases in the following equilibrium reactions:

straight i right parenthesis space HCl plus space straight H subscript 2 straight O space rightwards harpoon over leftwards harpoon space straight H subscript 3 straight O to the power of plus space plus Cl to the power of minus
ii right parenthesis space HNO subscript 3 space plus straight H subscript 2 straight O space rightwards harpoon over leftwards harpoon space straight H subscript 3 straight O to the power of plus space plus NO subscript 3 superscript minus
iii right parenthesis space CO subscript 3 superscript 2 minus end superscript space plus straight H subscript 2 straight O space rightwards harpoon over leftwards harpoon space OH to the power of minus space plus HCO subscript 3 superscript minus

Solution
left parenthesis straight i right parenthesis space HCl with acid below space plus space space stack straight H subscript 2 straight O with base below space space space leftwards harpoon over rightwards harpoon space space space stack straight H subscript 3 straight O to the power of plus with acid below space space plus space stack Cl to the power of minus with base below
HCl and H3O+ ions are acids as both have the tendency to donate a proton. H2O and Clions are bases as both have the tendency to accept a proton.
left parenthesis ii right parenthesis space stack HNO subscript 3 with acid below space plus space stack straight H subscript 2 straight O with base below space space space rightwards harpoon over leftwards harpoon space space space space stack straight H subscript 3 straight O to the power of plus with acid below space plus space space stack NO subscript 3 superscript minus with base below
HNO3 and H3O+ ions are acids as both have the tendency to donate a proton.
H2O and HO3 ions are bases as both have the tendency to accept a proton.
left parenthesis iii right parenthesis space stack CO subscript 3 superscript 2 minus end superscript with base below space plus space stack space straight H subscript 2 straight O with acid below space space space rightwards harpoon over leftwards harpoon space space space space space space stack OH to the power of minus with base below space plus space stack HCO subscript 3 superscript minus with acid below
CO subscript 3 superscript 2 minus end superscript space and space OH to the power of minus  ions are bases as both have the tendency to accept a proton.