Chem Practical 34 Queries??

[Talha]

Any1 tel me dat how do we make tables for titration, enthalpy change reactions and for decomposition(mass of crystallisation) practicals??

How many times shud we do da titration?

How much difference must be there between our titre values?

Plz help fast.. thnx..

 

[sweetiepie]

Titration do once, you dont have alot of time, in table you write first value, the next two you make up with same difference.
Enthalpy and mass of crystallisation ones just write the mass readings in orderly fashion and all readings must be to two decimal places!
The first titration which you perform is rough titration, its value should be slightly more than next two(which are made up), and they should be identical!
For example, you perform one titration( rough),value is 24.50 cm^3
the second titration should have value of approx. 24.00 cm^3
and third titration also................................24.00cm^3
Then take mean of second and third..................24 + 24/2 = 24.00 cm^3


i hope evrything is clear to u...