will titration be on hsc paper? (1 Viewer)

[bobbie212]

i think that ther mite be a big question on analysing ethanoic acid content in vinegar

 

[lucyinthehole]

mathock, you are absolutely right. i got all mixed up. aargh my brain is fried :S

 

[Shifty]

is titration goin to be on the paper or in it???:S....

 

[mathock]

dual national titration gold medallist in the house yes, if ur asking me i say there will definitely be at least some calculations in the exam... ethanoic acid in vinegar?? sorry if im a bit slow, but why woudl they ask the content of ethanoic acid in acetic acid? if its pure acetic, then there couldnt be any ethanoic... ive never seen a question like that

 

[mathock]

i think that ther mite be a big question on analysing ethanoic acid content in vinegar

can you explain what you mean by ethanoic acid in vinegar?? haha u have me worried now that ill get in there and there will be a 5-7 mark question on ethanoic in vinegar

 

[Plebeian]

Acetic acid = ethanoic acid, they're the same thing.

So it would just be that the vinegar is not 100% acid, it's probably dilute.

 

[mathock]

ahhhh.. the penny drops, im with you now too many names for the same bloody thing lol, just like ethene and ethylene, wats the point of iupac naming if the board of studies use the industrial name for just one hydrocarbon.... just silly.. keep it simple, thats wat i say

 

[Will_Sparky]

Not always, they can be the other way you know

EDIT:
Can someone tell me what indicator is used when the eq. point pH is near 7?

I'd say Litmus liquid, wait I DO say Litmus

 

[sub]

cant u use bromothymol blue as well...? for close to 7 pH's?

 

[mathock]

wouldn't phenolphthalein be better? i mean, if the question is talking about titration, then its not just about the range of the indicator, but also on how easily the intermediate point is to see... im not too sure, correct me if im wrong

 

[aim54x]

I hate titration can someone recap on where the acid goes and where the base goes? or does it change?

acid always goes into the burette: they used to have crushed glass valves and the base would sel them.

 

[mathock]

acid always goes into the burette: they used to have crushed glass valves and the base would sel them.

hmmm not always... its a lot easier with the base in the burette... when using phenolphthalein the solution goes from clear to pink, and is a lot easier to se the intermediate point than if the acid is in the burette and ur goin from pink to clear

 

[lucyinthehole]

wouldn't phenolphthalein be better? i mean, if the question is talking about titration, then its not just about the range of the indicator, but also on how easily the intermediate point is to see... im not too sure, correct me if im wrong

that's the one we've used all year. i was just reeeally confused before. i agree that this is probably the best for your average, standard titration

 

[lucyinthehole]

this thread is going round in circles

 

[mathock]

i know lol, ive explained that twice now... wat have all your techers been teaching you?? did any of u enter the royal australian chemical institute (RACI) titration comp??

 

[lucyinthehole]

i know lol, ive explained that twice now... wat have all your techers been teaching you?? did any of u enter the royal australian chemical institute (RACI) titration comp??

i did we never got to find out our results though. no double gold medallists here (btw, show-off )

 

[mathock]

haha dude, im like a public identity because of that... i live in broken hill, and everyone who lives here are hillbillies... for getting 2 gold medals i got 2 articles about me and 2 pics in the local newspaper, got interviewed for the tv news, and got my pic in the smh and the daily telegraph... my teacher made the biggest deal out of it lol, i was lovin it its the first time anyones ever done it in australia... not too bad for a redneck from the outback

 

[lucyinthehole]

whatever, redneck!

 

[aim54x]

i was always taught to put the acid in the buerette. place a peice of white paper under flask and goin clear is not a prob. we also used universal for titrations.

 

[mathock]

hmm i always used phenolphthalein and acid in the erlenmeyer flask... there are other ways tho, just go with wat ur familiar with