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Control of ph

Good day,

Am currently making some bio diesel as a school project. My bio-diesel had a pH level of 8.6 before the washing process. But after I washed it with with vinegar and distilled water the pH level is in 6.5. I evaporated all the water from the bio-diesel and its still has a pH of 6.5. What should i do to raise the pH to 7?

yours truly,

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