Titration Question (Titrating a base with an acid)

[luken93]

hmm thats kinda what I was thinking Thushan. but after reading some of the other posts, I'm not really sure.

whats the general consensus? should I use it or choose another one to be safe? :S

Is it THAT necessary to put it in? ie can you lose/gain marks for putting it in?
If it doesn't need to be there don't bother I suppose...

[thushan]

hmm thats kinda what I was thinking Thushan. but after reading some of the other posts, I'm not really sure.

whats the general consensus? should I use it or choose another one to be safe? :S

well it depends on how much indicator you put; if you put say 10 drops of indicator, then it'd be a source of error, but if you put say 3-4 then it shouldn't be.

I'd say you can write it in a SAC so long as you say how many drops of indicator you put and justify that the endpoint and the equivalence point would be too far apart for the results to be accurate

[pi]

hmm thats kinda what I was thinking Thushan. but after reading some of the other posts, I'm not really sure.

whats the general consensus? should I use it or choose another one to be safe? :S

Choose another one

Parallax and washing errors are my favourites

[thushan]

hmm thats kinda what I was thinking Thushan. but after reading some of the other posts, I'm not really sure.

whats the general consensus? should I use it or choose another one to be safe? :S

Choose another one

Parallax and washing errors are my favourites

Don't take what pi says as meaning that too much indicator is not a source of error; he means that it's tricky to explain properly how it would cause error. It's about playing the VCE game, unfortunately.

Moderator action: removed real name, sorry for the inconvenience

[pi]

Don't take what pi says as meaning that too much indicator is not a source of error; he means that it's tricky to explain properly how it would cause error. It's about playing the VCE game, unfortunately.

Yep, thats what I meant. Save some time by using the more common errors instead.

Moderator action: removed real name, sorry for the inconvenience

[man0005]

haha i think i'll change it then
its just me being too lazy to write another paragraph on a error

oh and thushan/pi was the other error that I said okay?

Moderator action: removed real name, sorry for the inconvenience

[thushan]

The first one i did was "incorrectly identifying the endpoint" (both too early and too late). If any of you think thats not an appropriate error please tell me
 

This one? Yeah it's good. It's really good actually.

[huaxiadragon]

I've actually placed too much indicator in a titration once.
As a result I lost one mark on the practical component of the SAC.

Since indicators are weak acids and bases as said previously. I would say it's accepted as an error.
Although frankly I recommend you not to risk it, there's many kinds of errors you can list in titration. (You can make up heaps)

-Rinsing burretes with water
-Making the standard solution crudely (filled more water than supposed to)

[Andiio]

Hmm...well obviously 3/4 drops (if you were meant to use say 2 drops) would be negligible and not worth writing in a SAC, but I've seen people who have added 7-10 drops simply by pushing too hard on droppers and they definitely couldn't say that there was no affect in doing so since they couldn't produce concordant titres with it. So yeh..10 may be pushing it with a satisfactory level of prac skill, but 7 drops still isn't a great amount over the 2 "suggested" drops.

@man0005
What errors do you have already?

My friend last year (2010) put like 20-30 drops of random indicators into our solution LOL... she got owned by the teacher