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Titration Evaluation
Today I did my first titration (with known conc sulphuric acid and unknown conc NaOH), and my results were a bit out - the titre volume was a lot lower than it was supposed to be. Do you know why that could have happened? I thought that maybe the beaker from which I was measuring out the NaOH from was not completely dry, so it diluted the NaOH a bit - what else could have happened? Did that even make sense? Thanks.
Reply 1
typical errors in titrations include titrating too quickly not stirring after each addition. Theres always losses involved in transferring solids no matter how accurate you think you are. Contamination may also be possible with other chemicals i.e. failing to rinse the burette and pipettes properly with distilled water beforehand. or leaving the funner you used to pour the solution into the burette in the bureete drops from this funner can cause a change in the volumes you read.
Have you taken into account that you were using diprotic acid?
Borek
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Borek
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Borek
Have you taken into account that you were using diprotic acid?
Borek
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Borek
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I'm sorry, what does 'diprotic acid' mean?
Thanks for the tips iceman_jondoe
Reply 4
An acid is a proton donor. It gives H+ to bases. Hydrochloric acid would therefore be considered as a monoprotic acid as it donates one proton hence its formula HCL. Concentrated sulphuric acid is diprotic because it donates 2 protons hence why its formula is H2SO4. Thats what borek was talking about
The mistake i always used to make was leaving the funnel in the burrete after i had poured the liquid in, so any excess could drip into the liquid. But this isn't the most significant error.
If it was your first titration, you are bound to make some errors, practice these and you will get good.
The biggest soruce of error is judging the end point I think because you might think hmm.. has the colour completly changed yet? This could lead to a lot more than required to displace the acid/alkali.
If it was your first titration, you are bound to make some errors, practice these and you will get good.
The biggest soruce of error is judging the end point I think because you might think hmm.. has the colour completly changed yet? This could lead to a lot more than required to displace the acid/alkali.
Reply 6
yeah judging the end point is difficult but thats why you do a rough test first to find an approximate value for the titre. o excalibur make sure you do repeats i knows its obvious but youd be surprised some people actuall only do one more repeat instead of three. And make sure your results are concordant 0.2-0.3 cm3 range between each other? i think
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