15.c 15. For this question you will need to use the figure to the right a. This

Question

15.c

15. For this question you will need to use the figure to the right a. This is a titration of a with a (1 pt) (pt) (1pt) Label the region of excess base on the figure ( pt) Label the equivalence point on the figure c. Label the buffer region on the figure b. e. Now explain how you could calculate the plH (give the equation you would use) (1 pt) @ the start of the titration (meaning V of the base added a. 0) b. @ the equivalence point. (1 pt) before the equivalence point (1 pt) c. d. after the equivalence point (1 pt) f Using the table provided determine what indicator you would use for this titration and (2 pts) explain why 8I Page

Explanation / Answer

before the equivalenc epoint and after some base is added, tere is buffer formation:

pH = pKa + log(A-/HA)

where:

pKa= -log(Ka)

A- = conjguate base formed, due to OH- addition

HA = acid left,

recall that

HA + OH- = H2O + A-

then, addition of OH- decreases HA in solution and increases A- in solution

therefore

we must accountin equilbirium,

pH = pKa + log(A-/HA)

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