# Titration :O

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Posted: 04-05-11 17:27 by abbie

titration oooo thats a killer ;)

i think the way to do it if you are unsure like i was is to think what is the exam bored looking for in the answer so look for key words and what are the key equipment used so even if you dont neccasarily know  the theory you can still pick up marks 1 mark = 1/4 a grade :) so answer every question

the calculations you need are hard but again look at a mark scheme and see the steps because even if you dont understand what your doing you can pick up marks for some working :)

i know this doesnt explain titrations but this is what i did for c3 and i got an a (it may not even come up )

good luck and read the revision books because they really go into detail do it slowly and dont move on until you understand what you have read then try and explain it to a poster or something :)

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Posted: 04-05-11 17:35 by Lizzy

Well this is what you need to remember! :

strong acid + strong alkali – use any indicator

weak acid + strong alkali – use phenolphthalein (indicator)

strong acid + weak alkali – use methyl orange (indicator)

For calculations use the triangle :

Number of moles

-------------------

concentration (mol/dm3) x volume (dm3)

Thats basically what they ask in the exam!

But you need to know the theory also! :

1 Measure an known volume of the alkali solution into a conical flask using a pipette

3 Now put the acidic solution into a burette. This long tube has measurements down

the side, and a tap on one end and can accurately measure the amount entering the

4 Open the tap to release the acid solution. The solution from the burette is released

one drop at a time, alongside swirling of the flask to ensure the solutions are mixed

5 Keep repeating Step 4 until the indicator changes colour to let you know the acid and

the alkali have completely mixed

6 Record the amount of acid you entered by reading the measurement on the burette

Be sure to repeat the entire process two or three times at least to ensure accuracy.

Good luck! :)

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Modified once, last modified by Fiyya <3 on Sun 8th May, 2011 @ 20:27

Posted: 08-05-11 20:26 by Fiyya <3

do the actual practial experiment a few times. You should remember it then!

Posted: 11-05-11 12:14 by Georgia

I did my full investigation chemistry coursework on titration and I'm still not totally sure, but its basically you put the acid you want to find the concentration of in a burette and you put a alkali such as sodium hydroxide in a conical flask underneath and add a few drops of an indicator such as phenolphthalein. and you slowly drip the alkali into the acid until you see the colour change instantly, this is the end point, where the acid has neutralized the alkali and the Ph becomes 7. There are also a load of formulas to work out the concentration and stuff but I can't really remember. I did my whole coursework on titration and vinegar but I got an A* so I'm happy :D

Modified once, last modified by Luke Eves on Wed 11th May, 2011 @ 23:37

Posted: 11-05-11 23:34 by Luke Eves

that's good. it sounds like you know it really well! don't worry. :)

Posted: 12-05-11 12:54 by Georgia

For the question on how many moles, whats the concentration of ... used etc just memba these formulas

In a solution - Number of moles= concentration x volume

and in grams - Number of moles= mass/Mr

You may need to rearrnge them ut thats basically it there really important you need to know them x

Posted: 19-05-11 18:56 by Lydia