Question

Molarity of NaOH: 0.1388 M

Unknown Acid Buret:

	Trial 1	Trial 2
Initial Buret Reading	27.11 ml	17.91 ml
Final Buret Reading	47.31 ml	42.01 ml
Volume of acid added	20.10 ml	24.10 ml

Results:

	Trial 1	Trial 2
Volume of NaOH at equivalence point	4.75 mL	14.03 mL
Volume of NaOH at one-half the equivalence point	2.37 mL	7.015 mL
pH at half equivalence point	4.88	4.21
pKa of unknown acid
Average pKa
Average Ka
Moles of unknown acid	Moles	Moles
M of unknown acid	M	M
Average M of unknown acid

can you show the steps as to how to find the answers for the missing boxes, work included as I would like to learn? and a few sentences explaining the results.