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as I understand it, titration is simply a method which determines the FFA content and the amount of catalyst needed to cause the chemical reaction esterfication to occur.
The titration process assumes the pH needed to cause a reaction to occur is 8.5. The addition of NaOH soultion during the titration process raises the pH of the oil and the phenythalein indicates a pH of 8.5 when it turns pink. The more NaOH you added (you mentioned 15?) during the process, the more acidic the WVO was.
The pH of the oil is certainly part of the titration process, and I am sure you could get an approximate pH from testing. I doubt you would get a numerical value or quantitative measurement from the results of titration that would give you an exact answer.
2003 F350 SRW CC 4x4 6.0L
Coolant Bypass Filter w/ Cat ELC
Amsoil Oil Bypass Filter
Hypertech MaxEnergy / Bully Dog Outlook
Cat and muffler DELETE!
Icon 2" leveling kit
Mickey Thompson MTZs
ARP Head Studs / New Ford OEM HGs
Sinister Diesel EGR Cooler
Blue Spring Upgrade
New HPOP STC connection