Complete the Ka2 expression for H2CO3 in an aqueous solution. Ka2 = 4.69 x 10^-11 =...

Question

Question

Complete the Ka2 expression for H2CO3 in an aqueous solution. Ka2 = 4.69 x 10^-11 = ___

science chemistry

Answer 1

Answer #1

We know that
Ka = [Products]/[Reactants]
Given
H2CO3 + H2O -> HCO3- + H3O+
therefore

Ka = [HCO₃^-][H₃O⁺]/[H₂CO₃][H₂O]

The concentration of water is too big and any changes in concentration are negligible, therefore we can drop [H2O] and get:

Ka= 4.69x10-11 = [HCO₃^-][H3O⁺]/[H₂CO₃]

Answer 2

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