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Find the H3O+ concentration of a 0.210 M hypochlorous acid solution (whose acid dissociation constant is...

Find the H3O+ concentration of a 0.210 M hypochlorous acid solution (whose acid dissociation constant is Ka=2.9×10−8).

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Answer #1

hypochlorous acid dissociated as

HClO + H2O    H3O+ + OCl-

it is monoprotic acid therefore [ H3O+ ] = [OCl-]

Ka = [ H3O+ ] [OCl-] / [HClO]

consider [ H3O+ ] = [OCl-] = X

then above equation become

Ka = X2 / [HClO]

substitute value

2.9 10-8 = X2 / 0.210

X2 = 2.9 10-8 0.210

X2 = 6.09 10-9

X = 7.8 10-5 =  [ H3O+ ] = [OCl-]

concentration of H3O+  = 7.8 10-5 M

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