Thread: Help! Chemistry problem

Just writing up a prac for chem about titrations, trying to find the concentration of acetic acid in a common house wine. Except our group forgot to actually measure the mass of the samples of wine we used.

So does anyone know the average concentration of acetic acid in a common house wine (white) so I can fudge the results so I can complete the prac report?

(And no it's not really cheating because the aim of the exercise is to mark our abilities with titration proceedure and writing up and analysing results)

An answer before tomorrow would be greatly appreciated.

try this answer, assume the mass of the wine sample -- best guess, and NOTE that it was a guess, and work from there.

Yeah I guess I could do that. But I don't even have a rough idea how much it should be

EDIT: Hahahaha, whoops. Titre volume is meant to be in LITRES. Screwed up right at the start. I should be able to get reasonable data now

well surely you know the volume you used? thats a good place to start when you're trying to figure out the mass.

ask someone else for their answer and change it a little bit

thats what I always do

Hmmm you are in a spot of trouble....

The aim of the exercise is to mark our abilities with titration proceedure.

Titration is one of the most common protocols needed in chemistry. Even if you fudge the results, they will be different showing the marker that indeed you didn't follow the procedure.

So the easiest way, would be to state that the measurement wasn't taken, and then to state an assumption, and show you working from there.

I know from the marking experience marking 1st year students, that a fudge really stands out from a mass of people doing the same experiment.

Well I remember finding the mass of the wine once. But we forgot to do it for the other samples and we must've lost to original. But I got marked off for the 'weighing of the wine sample' so s'all good.

The volume was 20ml. That'd roughly be 20g yeah?

Assuming roughly 20g I got results ranging from 0.5% to 0.45% That sound about right and also does it sound precise?

if it was 20ml, then it will be 20g

for water, at least

not sure how much 1ml of wine weighs

i'd assume it was the same

20ml ~ 20g
How accurate do your answer how to be?
Do you have to do errors?

I would hope so. His doing Yr 12 Chem (I think).