Titration Practical Exam Troubles! (1 Viewer)

[untouchablecuz]

i just received my titration practical exam back, and lets just say my mark was not the best.

MUCH of the marks i had lost were due to the fact that i had done the exam and answered the questions based on the presumption that the solution of KNOWN concentration is poured into the burette.

my teacher however, sees differently and is set on the "fact" that the solution of UNKNOWN concentration is is poured in the burette.

i have gathered evidence (both from textbooks etc and mathematical) to support my point of view (that either way is fine), but before i take it any further i'd like to know what you all think OR know?

known or unknown in the burette?

 

[annabackwards]

Doesn't matter as the calculations should come out as the same answer.

At my school we usually use an UNKNOWN concentrationn of NaOH to titrate with a known concentration of a random weak acid (usually acetic). The NaOH goes into the burrette and phenolphthalein is used

So yeah, take further action!

 

[untouchablecuz]

i will, funnily enough, my calculated concentration of the unknown turned out to be 0.28M - the actual concentration was 0.29M

 

[annabackwards]

i will, funnily enough, my calculated concentration of the unknown turned out to be 0.28M - the actual concentration was 0.29M

Hehe, congrats

Now go and get those well deserved marks back

 

[Pwnage101]

As stated above, it does not matter which way, you get the same answer. But apparently it is correct chemistry convention to put the unknown in the Burette, just like it is correct chemistry convention to, when drawing a diagram of a galvanic cell, to place the ANODE on the LEFT.

 

[annabackwards]

As stated above, it does not matter which way, you get the same answer. But apparently it is correct chemistry convention to put the unknown in the Burette, just like it is correct chemistry convention to, when drawing a diagram of a galvanic cell, to place the ANODE on the LEFT.

Oh wow, i never new that! Do you know if that's the same thing for electrolytic cells?