3 Biodiesel Titrations

haha... I feel bad that i felt asleep in my chemistry class now, Totally fogot how to do titration. :(

To follow up on my previous post (which isn't appearing yet because it has to be approved), i figured out the math at the end.

I forgot to figure in the 7.5 ml (for KOH) or 5.5 ml (for NaOH).

So, from the 3 titrations:

1st: 3 ml titration solution used
2nd: 4 ml used
3rd: 4 ml used

3 + 4 + 4 = 11 ml, average would be about 3.67 ml.

7.5 + 3.67 = 11.17 ml <-- the amount of base to add per liter of oil would be closer to this, rather than 12.

Hi Graydon, i'm a little unclear on the math at the end. Can you please clarify?

Basically what's not so clear is if i should base the final amount of titration solution on the remaining solution in the syringe, OR the actual solution that was used to neutralize the acid.

1st titration: 3 ml titration solution used / 7 ml solution remaining

2nd titration: 4 ml used / 6 ml remaining

3rd titration: 4 ml used / 6 ml remaining

How did you arrive at 12 grams?

How come you don't blank your solutions?

very informative and helpful specially for laymen like me

what do you recommend for example lets say:
i got oil from kfc and oil from bk, mix them and take the sample of oil from the mix? is it ok(to mix oil in order to have the sample)?

no it will be different because you wont add 7 to it you will add 5 instead

same with NaOH?
if you need 4 ml of titration you will use 9.5 g/l catalyst?