HX is a weak acid that reacts

HX is a weak acid that reacts with water according to thefollowing equation: HX(aq) + H2O(l) H3O1+(aq) + X1-(aq) Ka =3.16e-07 What is the equilibrium concentration of hydronium ion ina solution that is 0.0538 M in HX and 0.116 M in X1- ion?


HX (aq) + H2O(l)   ——————–> H3O+(aq) +X-(aq)

0.0538                                                  0       0.116        

0.0538 -x                                              x           0.116+x

Ka = x (0.116+x) / 0.0538 – x  

3.16 x 10^-7 = x (0.116+x) / 0.0538 – x

x = 1.47 x 10^-7

[H3O+] = 1.47 x 10^-7 M

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