Posted by Alex on Saturday, March 31, 2012 at 11:16pm.
mols NaAc = 8.203/60 = about 0.14 but you need to be more accurate.
M NaAc = 0.14/0.1L = about 1.4M
millimoles NaAc = 20 mL x 1.4 = 28
mmols HAc = 20 mL x 1.OM = 20
mmols HCl = 5 mL x 0.50M = 02.5
..........Ac^- + H^+ ==> HAc
initial...28.....0.......20
add..............2.5.........
change....-2.5..-2.5......+2.5
equil....25.5.....0........2.5
Recalculate the numbers to be more accuratae, substitute those numbers into the Hendeson-Hasselbalch equation and solve for the pH.
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