errors and improvements in titrations Watch

Sparrohawk
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any help in this field anyone--- the coursework is analysis of lawnsand....


titrations in general.

thanks
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BeccaE
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Lawnsand...? I don't understand.

What exactly do you need help with, then I can try and help
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Sparrohawk
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limitations and improvements in a simpletitration experiment
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BeccaE
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Well, limitations could be accuracy of the burette / other equipment you're using, if you can't measure to many d.p., as well as knowing exactly when the turning point is- the fact that you have to do it by eye.

Improvements could be made by possibly doing it on a larger scale, thus making it more precise, using a balance that weighs to more d.p., putting the solution on a white tile to see the colour change...

Is that the kind of thing you were after?
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emerley
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yeah the things mentioned above

also things like...

- rinsing the burette with water, and then your titrant before using it (cleans it and makes sure theres no residual water)
- is your titrant clear? coloured titrants make it hard to read the scale
- adding it in drops as you near the end point
- is your titrant reacting or oxidising or anything in the tube? think about how you could stop it, or alternatively just do the experiment quickly
- reading the burette to the bottom/top of the meniscus - make it the same every time
- reading to correct decimal places?
- are you making sure all your solutions are well swirled before you use them - so nothing settles at the bottom?
- using volumetric pipettes for measurements

bla bla bla! i could dig my old coursework out if you need any more
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IguessIwin
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(Original post by emerley)
yeah the things mentioned above

also things like...

- rinsing the burette with water, and then your titrant before using it (cleans it and makes sure theres no residual water)
- is your titrant clear? coloured titrants make it hard to read the scale
- adding it in drops as you near the end point
- is your titrant reacting or oxidising or anything in the tube? think about how you could stop it, or alternatively just do the experiment quickly
- reading the burette to the bottom/top of the meniscus - make it the same every time
- reading to correct decimal places?
- are you making sure all your solutions are well swirled before you use them - so nothing settles at the bottom?
- using volumetric pipettes for measurements

bla bla bla! i could dig my old coursework out if you need any more
yes please
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Horrorshow
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oh you might aswell add things like using higher grade equipment aswell, as this would reduce percentage error given that percentage error = set equipment error/volume (measurement)
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emerley
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(Original post by IguessIwin)
yes please
lol youre not the OP!
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voleman
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(Original post by emerley)

- rinsing the burette with water, and then your titrant before using it (cleans it and makes sure theres no residual water)
-is your titrant clear? coloured titrants make it hard to read the scale
-adding it in drops as you near the end point
-reading the burette to the bottom/top of the meniscus - make it the same every time
-reading to correct decimal places?
- using volumetric pipettes for measurements
TBH you should be doing most of these things before you even start thinking about limitations. Mentioning personal incompetence gets you no marks.

Errors/limitations should be things you have no control over, like accuracy of the burette and other measuring apparatus, as well as the fact that the endpoint is subjective.
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emerley
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*shrugs* in my coursework we were told to put a section with things like that, explaining what we did correctly in the method in the first place, before we criticised what went wrong

so they can apply to either really
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Science-n11
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Hi can send pdf of your coursework please and are you doing applied science extended certificate. I really need help!!!
(Original post by emerley)
yeah the things mentioned above

also things like...

- rinsing the burette with water, and then your titrant before using it (cleans it and makes sure theres no residual water)
- is your titrant clear? coloured titrants make it hard to read the scale
- adding it in drops as you near the end point
- is your titrant reacting or oxidising or anything in the tube? think about how you could stop it, or alternatively just do the experiment quickly
- reading the burette to the bottom/top of the meniscus - make it the same every time
- reading to correct decimal places?
- are you making sure all your solutions are well swirled before you use them - so nothing settles at the bottom?
- using volumetric pipettes for measurements

bla bla bla! i could dig my old coursework out if you need any more
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TODTEMPLE01
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(Original post by Science-n11)
Hi can send pdf of your coursework please and are you doing applied science extended certificate. I really need help!!!
This thread is 11 years old...
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Science-n11
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Oh sorry I didn’t see it. Do you do applied science extended certificate
(Original post by TODTEMPLE01)
This thread is 11 years old...
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TODTEMPLE01
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(Original post by Science-n11)
Oh sorry I didn’t see it. Do you do applied science extended certificate
Nope sorry, doing a level
Posted on the TSR App. Download from Apple or Google Play
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Science-n11
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Do you know anyone who doing an applied science extended certificate
(Original post by TODTEMPLE01)
Nope sorry, doing a level
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TODTEMPLE01
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(Original post by Science-n11)
Do you know anyone who doing an applied science extended certificate
No
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straykids_Billie
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(Original post by TODTEMPLE01)
No
(Original post by Science-n11)
Do you know anyone who doing an applied science extended certificate
i currently am
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