15.d CHEM 210 (Donohoue) Due: Thursday 11/16/2017 (Last Day of class) 15·For thi

Question

15.d

CHEM 210 (Donohoue) Due: Thursday 11/16/2017 (Last Day of class) 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) b. Label the equivalence point on the figure (pt) (1 pt) (1pt) Label the buffer region on the figure Label the region of excess base on the figure Now explain how you could calculate the pH e. (give the equation you would use) (1 pt) a the start of the titration (meaning V of the base added 0) a. b. the equivalence point (1 pt) before the equivalence point (1 pt) c. d after the equivalence point (1 pt) Using the table provided determine what indicator you would use for this titration and explain why f. (2 pts) 81 Page

Explanation / Answer

the pH after equivlance point:

depends mainly on the XOH- base added

recall that excess base will be added so

HA + OH-

HA = will not dissociate if OH- is in excess

then

Vtotal = Vacid + Vbase

[OH-] = Mbase*Vbase / (Vacid + VbasE)

then

pOH = -log([OH-])

therefreo

pH = 14 - pOH

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