chem practical....

[Areeba Khan]

hw can we determine the end point in titration?

 

[aalmuhannadi]

hw can we determine the end point in titration?

Typically in a titration if you keep shaking the beaker and there is no colour change (i.e. the colour remains), then that is the point at which the titre is reached. However, note that it's different between each (e.g. sometimes you need to wait a long time like if you shook and no colour change, but then after 20 seconds of shaking it would change colour). Also, you need to do 2-3 titrations within 0.01cm^3 of each other I believe and average them to get the accurate value. Can anyone correct me?

 

[Areeba Khan]

like some ppl says dat on the frst tinge u hav 2 stop nd when like u again shake it that tinge disaappears? i was confused when exactly do we have 2 stop when derex a uniform color (e.g pale pink) or when u seee the first tinge of pink color in the centre only nd dn when u shake the mixture it disspears

 

[aalmuhannadi]

like some ppl says dat on the frst tinge u hav 2 stop nd when like u again shake it that tinge disaappears? i was confused when exactly do we have 2 stop when derex a uniform color (e.g pale pink) or when u seee the first tinge of pink color in the centre only nd dn when u shake the mixture it disspears

Yes you have to open the burette and allow 2cm^3 to flow into the beaker and then stop, shake the beaker and see if the colour disappears when you shake it, if so then keep adding 2. Keeping on adding 2cm^3 repeatedly and shaking until you reach a point where when you shake the beaker the colour does not change, this is the rough titre (the point where you stop). Now you know that the real titre is within the 2cm^3 range which you reached, so you have to repeat the titration but add it more slowly to the beaker once you reach that 2cm^3 range to to find the more precise point where it stop changing colour, and this will get you the real accurate titre value.

 

[Areeba Khan]

okaaaay thankyou

 

[aalmuhannadi]

okaaaay thankyou

You're welcome.. really hope that helped sorry if it was a messy explanation