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Tris pKA = 8, therefore at pH = 8, the volume is 4.5mL. However the equivalence point simply can't be at 9mL, looking at this graph. It should be between approximately 9.5 and 10.5, no?

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  • $\begingroup$ You were titrating diluted tris? $\endgroup$ – Mithoron Nov 4 '17 at 18:37
  • $\begingroup$ Yes, 100mL of 0.1M tris. $\endgroup$ – Burton Guster Nov 4 '17 at 18:40
  • $\begingroup$ It's rather weak base and conc. was low so this equiv. point simple is only slightly visible. $\endgroup$ – Mithoron Nov 4 '17 at 18:46
  • $\begingroup$ But how do I determine the actual value? $\endgroup$ – Burton Guster Nov 4 '17 at 18:47
  • $\begingroup$ chemistry.stackexchange.com/questions/28054/… $\endgroup$ – Mithoron Nov 4 '17 at 18:56

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