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Ka value is not given in the question, solve for Ka to answer the questionPart C Calculate [H3O+] of the following polyprotic acid solution: 0.130 MH3C6H5O7. Express your answer using two significant

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Answer #1

Concentration of Citric acid = H3C6H5O7 = 0.130M

Ka value of Citric acid = 7.4 x10^-4

                       H3C6H5O7 + H2O --------------------- H3O+ + H2C6H5O7-     

    Initial             0.130                               0              0

    change          -x                        +x    +x

equilibrium    0.130-x    +x    +x

Ka = [H3O+] [ H2C6H5O7-] / [ H3C6H5O7]

    7.4x10^-4 = x*x / ( 0.130-x)

for solving the equation

x= 0.00944

[H3O+] = 0.00944M

[H3O+] = 9.44 x10^-3M

     

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