Summary Chemistry errors and uncertainty

Uncertainties




any piece of apparatus uncertainty is taken as one half of the
smallest divisions on the apparatus




e's burette with scale marks
of d1cm uncertainty is 0.05cm

unless the question directly thevalue with t
copythevalue
gives directly


ifuse two ridings Ewirisitiniteasiremene combine the uncertainties


e.g final initial value sum errors up

for I measurement if digital
0.8 error isto 1
Percentage
error it non digital 0.8 error is10.05

error
difference
x2
reading
X 100



Significant figures


take the least number of significant figures in the question

always use significant figures and not decimal places when considering errors

noteC pH usually take 2 d maydeducemarks
p