simple titration question about distilled water (1 Viewer)

[Li0n]

i don't understand why you need to put an approximate ammount of distilled water into the conical flask of the unknown solution, what the hell is the point of it? i see why it is needed for solid's (to dissolve them) but not with the solution.
Is this done to neutralize the ammount of indicator put in (as indicators are slightly acidic) ??

 

[Xayma]

It is used to rinse the conical flask, to remove any chemicals which may affect the titration.

It is needed to dissolve the solids to make it react properly in the Titration (trying to react a solid "base" and gaseous "acid" isnt going to work).

 

[joeyhopper]

-Apart from rinsing the equipment and dissolving in solids, it is used to run down single( or even half) drops of solution from the burette that is just dangling at the tip and any solution that is stuck at the side of the flask.

- When you get close to the end-point, preferrablely, you should first decrease the amount that you release at a time and use a wash-bottle to run down any droplets of leftovers and swirl the solution before you proceed.

-The addition of 'distilled' water does not affect the neutralisation and hence the titration of the solution.

 

[CM_Tutor]

The washing of walls of a conical flask is to ensure that all added chemical is in the solution and not on the walls - this is both chemcical from swirling, from adding liquid via pipette, and from splashing that occurs when a drop from the burette reaches the solution.