[agyawali]

im doing an experiment for my A2 coursework, on partition coefficient of butanedioic acid between water and 2-methylpropan-1-0l.

and i did a little bit of research and found a similar experinment, and when carriying out titration, for the organic layer, they add 10cm3 of distilled water with 10cm3 of the orginic layer and then titrate it but when it comes to the titration of aquous layer they don’t add any water.
I wonder why it is necessary to add about 10cm3 of distilled water to the organic layer before titration with the sodium hydroxide.

[agyawali]

pleaseeeee helpppppppppp!!

[Stupidguy]

(Original post by agyawali)
im doing an experiment for my A2 coursework, on partition coefficient of butanedioic acid between water and 2-methylpropan-1-0l.

and i did a little bit of research and found a similar experinment, and when carriying out titration, for the organic layer, they add 10cm3 of distilled water with 10cm3 of the orginic layer and then titrate it but when it comes to the titration of aquous layer they don’t add any water.
I wonder why it is necessary to add about 10cm3 of distilled water to the organic layer before titration with the sodium hydroxide.

Hi mate. it looks like you went through all to succeed in this coursework. I'm going through exactly what what you were going through when you posted this (or probably even worse). I've been made to do this coursework and I don't know where to start. I would be overjoyed if you could be most gracious and grant me either your aims of the coursework or even the entire coursework so that I can read over it in the summer so that it may act as a guide for me in the coming year, which is going to be extremely difficult!!

Thanks very much.

P.S. If anyone else who has done this coursework (or not) can help me in any way, i would be very glad. I have heard that there is a great helpful community spirit on this forum. I hope that this will also extend to me.

[agyawali]

(Original post by Stupidguy)
Hi mate. it looks like you went through all to succeed in this coursework. I'm going through exactly what what you were going through when you posted this (or probably even worse). I've been made to do this coursework and I don't know where to start. I would be overjoyed if you could be most gracious and grant me either your aims of the coursework or even the entire coursework so that I can read over it in the summer so that it may act as a guide for me in the coming year, which is going to be extremely difficult!!

Thanks very much.

P.S. If anyone else who has done this coursework (or not) can help me in any way, i would be very glad. I have heard that there is a great helpful community spirit on this forum. I hope that this will also extend to me.

Hey yes i went to hell and back when doing this course work!!
but in the end i did it n i did it good.

at first everything about this course work looks complicated but after you do the research and few experiments it gets simpler ( well the simplest it can get, which aint that simple lol)

but yes i will be happy to help!!!!
so are u doing ur A-levels now?

what exactly is the question u are investigating?
and what have you found out so far? (any research?)

[Alchem]

I wonder why it is necessary to add about 10cm3 of distilled water to the organic layer before titration with the sodium hydroxide. [/QUOTE]

The sodium hydroxide used for the titration is a solution of sodium hydroxide in water. If you add this alkali solution to the organic layer as such, it will not mix properly, and you will get an erroneous titre value. If you add 10 cm3 water to 10 cm3 organic layer, it will become a 50% (vol/vol) aqueous solution, in which the alkali will freely dissolve. So, your titration will be accurate.

With the water layer, there won't be any miscibility problem for the alkali solution. So, you don't have to add any water to the water layer before titration.