Activity #6 Titrations 1. Consider the titration of an acetic acid solution with

Question

Activity #6 Titrations 1. Consider the titration of an acetic acid solution with a sodium hydroxide solution at the following three stages of the titration: () before the titration begins, (ii) when the number of moles of sodium hydroxide added is equal to 1/2 the number of moles of acetic acid originally in the beaker, and (iii) at the endpoint. For each of the following questions, select one of the above three stages and explain your reasoning a. When does the reaction solution contain mostly acetate ion? b. When does it contain mostly acetic acid? c. When does it contain significant amounts of both? At what point during the titration is the reaction solution's pH at its lowest value? d. e. At what point is the pH at its highest value?

Explanation / Answer

1. a. Reaction solution will contain mostly acetate ion at the endpoint (iii) because at the stage all the H+ ions will be dissociated from acetic acid and it will quench from the hydroxide ions released via the dissociation of sodium hydroxide.

b. It will contain mostly acetic acid at the time of starting the experiment (i).

c. It will contain the most significant amount of both in the middle of the titration experiment when the no, of moles of sodium hydroxide in the solution is almost half the no. of moles of acetic acid (ii).

d. The ph of the solution will be lowest at the time of attainment of the endpoint (iii).

e. The ph of the solution will be highest after the attainment of the endpoint (iii). At that time even a single drop or NaOH solution will lead to the sharp change in ph i.e. from neutral to the basic.

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