You emailed me, though you had your membership here so as to not allow people to email you, and your other email address didn't work!
So, what's your problem? Here's the email reply I wrote to you that got sent back....
Did you just wake up this morning wanting to do this, or do you have more to go on?
What are you plotting against what? pH versus volume? pH versus time? And to save me going to look it up - what relationship exists between the variables you are plotting against each other? If you are wanting to do a statistical analysis of H and OH ions, then you'll need a model of molecular interaction.