CIE CHEM. PRACTICALS

[sweetie]

HEY PPL, cud any1 ans my 2 que.

 what does it mean when dey say:

1." measure the vol. from the  burette to 0.05 cm³" AND IF IT MEANS TO 2 d.p then how do we do it for a burette calibrated at 0.1cm³ intervals??

2.  measure temperature to da nearest 0.01^0C?

[tmisterr]

well it could be that they mean it as accuracy/uncertainty. Most schools, including mine use burettes that have the smallest reading as 1cm³ but as you know uncertainty of an instrument is the least reading divided by two, which is +/-0.05cm³ so what they mean is that they want to record to that uncertainty, But just ask the practical teacher at your school to be sure.

the temperature one i am not sure exactly, maybe someone else has any ideas??

[sweetie]

newayz, thanx 4 da help 


in this specimen paper,  when we draw da table , for the temp of FA1  before the first  addition of FA2 the temp will be for eg.24 ,  and after the first addition its 32

, so will we consider this 32 as the initial for the second addition or we still take 24 as the initial temperature???

[tmisterr]

take 24 as initial temperature for each addition