Metrohm viva 1.1 - Manual (Page 708)

5.6 Evaluation subwindow
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696 ￭￭￭￭￭￭￭￭
viva 1.1
Units for results
Name Symbol Unit
Mass m g
Volume V L
Mass concentration c g/L
Volume concentra-
tion c L/L
Substance concentra-
tion c mol/L
Time t s
Current I A
Amount of substance n mol
Electrical charge Q C = As
Electrical potential U V = WA -1
5.6.7.2 Result calculation from calibration curves and error calculation
For all three possible calibration methods, the concentration (e.g. a mass
concentration, a volume concentration or a molar concentration) in the
measuring vessel must be determined with the help of a calibration curve.
This calibration curve itself must be determined by the measurement of
solutions for which the concentrations are known. The parameters for a
specified linear or nonlinear curve function are then calculated from the
value pairs Evaluation quantity / Concentration. Because, as a general
principle, the calculations of the calibration curves and the results based
on them as well as the associated error calculation remain the same for all
calibration methods, the calculation procedure that is applied is described
in general terms below.
The connection between the variables x and y are sought on the basis of
the measured values x
i
, y
i
, for which it is assumed that the following pre-
requisites apply: