Trichloroacetic acid is used to treat genital warts. Write the equilibrium reaction for this weak acid in aqueous solution. A) What substances are present at equilibrium? B) Are the concentrations of the acid and constant or changing at equilibrium? C) What happens to the equilibrium if more trichloroacetate is added to the reaction? D) If more hydronium ions are added to the reaction, does the reaction shift to the left or right?
a)
the equilibrium is given by
CCl3COOH + H20 ----> H30+ + CCl3COO-
b)
at equilibrium
the concentration of acid is constant
c)
CCl3COOH + H20 ----> H30+ + CCl3COO
now
we know that
according to Lechatlier principle
the equilibrium will shift in such a direction to counter the change
given
more CCl3COOH is added ,
so
the conc of CCl3COOH is increased
so
the equilibrium will shift in a direction to decrease the conc of CCl3COOH
so
the equilibrium will shift towards the products
d)
similarly
the conc of H30+ is increased
so
the equilibrium will shift to the left to decrease the conc of H30+
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