Titration

[wantingtoknow]

We're going to be doing titrations for our prac exam. Is there anything I should look out for and be aware of?

 

[imoO]

Review the titration process very carefully. Things such as what to rinse the burette with...making the solution with DISTILLED WATER instead of tap water...etc..

It's simple, but there a plenty room for error

 

[Nuendo]

I usually only complete two titrations - one test run (let the solution in the burette flow out quickly and gain a rough idea of the equivalence point), and one proper run (I'm pretty lazy when it comes to titrations, so I put all my time and effort into gaining just the one result and using that as my average, ahah).

My pet hates regarding titration:

- acid/base on the sides of the conical flask (always wash it down with distilled water)
- bubbles in the burette and/or pipette (give it a good tap, or refill)
- not using enough indicator (textbooks say to put around 3-5 drops, put 10 times that amount)
- solution turns into the equivalence colour, but then changes back to its original colour after three seconds or so (this is actually a good thing, and I usually take this reading as my final result)

Hope this helps,
Good luck in your exam!

 

[Barrister]

Pretty simple really, all you have to do is follow the steps outlined in standard titration procedure. Make sure you rinse the burette and the pipette very carefully with both distilled water and then the substance it will contain, just to be sure.
Never use any more than 6 drops of indicator, my experience with phenolpthalein is that anything more will affect the equivalence point.
Run a test/rough run first and then complete three full titrations, minimum accuracy of + or - 0.1ml from medium result.
If two are exactly accurate, the third may be ignored.

 

[wantingtoknow]

It's simple, but there a plenty room for error

Yeah, that's why I'm worried. My experiment will probably turn out to be a disaster :mad1:


But thanks for the tips, people.

 

[Count Chocular]

make sure you know the difference between the END POINT, and EQUIVALENCE POINT

 

[wantingtoknow]

What IS the difference?

 

[Count Chocular]

the end point is when you notice a permanent colour change, and the experiment is over.

the equivalence point is when there is exactly the same amount of moles of each substance and theoretically the solution is neutral

 

[wantingtoknow]

How do you know when we've reached the "equivalence point"?

 

[Count Chocular]

you dont.
(but u should try)

 

[dongerluo]

Same

was watching titration on YouTube..

 

[hena_xox]

Do you know what acid and base ur using?...coz i just did my prac exam on titrations yesty.

 

[renny 123]

I have my titration prac tomorrow..
How close should the titres be to be considered close enough to include, within 1ml of each other?

 

[brenton1987]

I have my titration prac tomorrow..
How close should the titres be to be considered close enough to include, within 1ml of each other?

0.1 mL

 

[wantingtoknow]

How do you know what to put in burette and flask?

 

[brenton1987]

How do you know what to put in burette and flask?

Acid in the burette, base in the pipette.

 

[hena_xox]

i did my titration prac on wed and i but my NaOH(base) in the burette and my HCl (acid) in the pipette...

What acid,base and indicator r u using

 

[wantingtoknow]

Does it matter where you put the base and acid? :S

@ hena_xox: How did your prac go? & No idea, we got told what we're using on the day x_x

 

[Crashy19]

doesn't the one that you are measuring go in the pipette
if you know the amount of one, you put that in the burette because then you can get a reading from the pipette on to how much you have used to get the indicator colour right

 

[marcquelle]

doesn't the one that you are measuring go in the pipette
if you know the amount of one, you put that in the burette because then you can get a reading from the pipette on to how much you have used to get the indicator colour right

thats what i thought as well