EDTA question. (1 Viewer)

[rachunara]

edta titration shows the conc of both Ca and Mg ions whereas AAS only identifies Mg. thus the conc in EDTA is higher

 

[rachunara]

i meant AAS only shows Ca conc

 

[DraconisV]

The part of hardness was completely crazy for me
Initially i thought errors in titration but thats to general and anyone could get it. So i sat there for like 3 minutes thinking and then decided to read the question again. I seen Mg2+, and it clicked. Im so happy.
It made me feel so smart even though alot of people on here got it aswell. Im just proud that i found the trick and it was reading the question. LOL

 

[angmor]

In conclusion i think there is many answers to this question. i dont remember it saying give the BEST reason right? so yeah, many possibilities as to how to answer this question.

also, i believe EDTA only titrates the concentration of CaCO3?

 

[Petinga]

I reckon angmor is right as my notes only says that a titration with edta gives the concentration of only calcium carbonate in ppm.
Therefor i believ my answer was correct which was that titration are not reall good for determining minute concenrtrations due to inaccuracy of measurements and equipment

I dnt but i know i made many stupid mistakes in the exam. I think i might have evenb stuffed the glucose calculation by not reading the question. i think i got 7oo something grams because i avergaed da co2 mass rather than finding increase each day. how could i make a stupid mistake, i am da top of my school

 

[haque]

EDTA gives an indication of the hardness i.e it measures both Mg and Ca, hence it is the Mg that caused this higher ocncentration

 

[fallen__angel]

yeah, what haques wrote

 

[jpsorbara]

Well i think you guys are all just saying some of the correct answers so theres really right or wrong, becasue most probably they will accept a number of responses.
BTW: my answer was because he probably over shot the equivilence point in his first run, and included it

 

[jackandmilo]

omg....where was this question and what is it about???

i dun rememebr doing a question like that something about titration?...huh?

and if so how many marks was it worth?