titration, pH, Ka chemistry problem? rly need ur help?

[neehe]

The following data was collected for the titration of 0.145g of a weak acid with 0.100M NaOH as the titrant:
Volume NaOH added, mL
0.00 5.00 10.00 12.50 15.00 20.00 24.00 24.90 25.00 26.00 30.00

pH
2.88 4.15 4.58 4.76 4.93 5.36 6.14 7.15 8.73 11.29 11.96

a) What is the pH at the equivalence point?
b) Give the Ka, and pKa value of the acid. Explain.
c) The following acid-base indicators are available for to follow the titration. Which of them would be most appropriate for signaling the enpoint of the titration? Explain.
Color Change
Indicator Acid Form Base For pH Transition Int.
[Bromphenol blue] yellow blue 3.0 - 5.0
[Bromthymol blue] yellow blue 6.0 - 7.6
]Thymol blue] yellow blue 8.0 - 9.6