What effect would adding sodium benzoate (NaC,Hs02) have on the following reacti

Question

What effect would adding sodium benzoate (NaC,Hs02) have on the following reaction? ??,H502 (aq) + H2O (?) GH502. (aq) + H3O+ (aq) Which direction would the equilibrium shift? Draw an arrow above the reaction arrow to indicate the direction the reaction will proceed. With the addition of sodium benzoate, what will happen to the concentration of the hydronium ion as a result? a. b. With the addition of sodium benzoate, what will happen to the concentration of the benzoic acid as a result? c. Because of the addition the sodium benzoate, the benzoate ion (C,Hs02) concentration will increase initially. What happens to the benzoate ion concentration as the equilibrium is reestablished? d.

Explanation / Answer

HC7H5O2(aq) + H2O(l) <-----> C7H5O2-(aq) + H3O+(aq)

a)

By adding sodium benzoate there is increases in the concentration of C7H5O2- so the concentration on product side increases and the reaction shifts to backward direction or the equilibrium shifts to left side.

b)

By adding sodium benzoate there is increases in the concentration of C7H5O2- and the concentration H3O+ ions decreases due to the backward reaction.

c)

By adding sodium benzoate there is increases in the concentration of C7H5O2- and the reaction shifts to left side so there is increase in the concentration of Benzoic acid.

d)

By adding sodium benzoate there is increases in the concentration of C7H5O2- on product side and the original concentration of C7H5O2- is decraesed due to more amount C7H5O2- from the sodium benzoate, hence after reestablished equlibrium concentration of C7H5O2- is decresed.

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