RESULTS OF POLARIMETRY

Table 1: Polarimetric measurements of sucrose and identification of concentrations of 3 unknown samples

α [o] of known solutions
of sucrose		 α [o ] of unknown solutions
of sucrose
c [%]
2.5
5.0
10.0
15.0
20.0
I
II
III
meas.
1
                
2
                
3
                
4
                
5
                
α [o]
average value
                
specific rotation
αD [o]
 * * * * *

X

X

X
average specific rotation
αDa [o]
  

X

X

X
cs [%]

X

X

X

X

X

 ** ** **

LEGEND:
c = concentration of known solutions
cs= concentration of unknown samples
meas. = measurements
I, II, and III = unknown samples

FILL THE FIELDS WITH ASTERIKS ("*" or "**") USING THE FOLLOWING FORMULAS:

FIELDS: *
αD = (α [o] * 100) / 1 * c

α [o] = average value for each known concentration
c = concentration of known solutions
l = length of polarimetric tube = 1 dm


FIELDS: **
cs = (α [o] * 100) / [α]Da

cs= concentration of unknown sample
α [o] = average value for each known concentration
αDa = average specific rotation (known concentrations)


CONCLUSIONS:
Concentrations of the unknown samples are:........................................................................



contents previous task next task exit