Metrohm 765 Dosimat User Manual download pdf (Page 18)

2.2. Modes

765 Dosimat

The formulae for calculation of the volume to be dispensed "add V" are shown in the

following table, with

cnt content in the selected unit

M molar mass of substance to be weighed out

f factor

dens density of the solvent

s weight of substance

Unit Formula for

add V =

Amount-of-substance

concentration

mol/L

mmol/L

f·s·10

cnt·M

f·s·10

cnt·M

Mass concentration

g/L

mg/L

f·s·10

cnt

f·s·10

cnt

Mass fraction

ppm

f·s(10

-cnt)

cnt·dens

f·s(10

-cnt)

cnt dens

Molality

mol/kg

mmol/kg

s·10

cnt·M·dens

s·10

cnt·M·dens

Application of factor f

Factor f for ionic standards

With ionic standards, the mass fraction of a single ion A is usually specified. On the other

hand, the solution is prepared from A

, e.g. a standard of 10 ppm Pb

prepared from

Pb(NO

)

. The factor f is calculated from the formula:

n*M(A) m*M(B)

f = ———— or f = ————

M(A

) M(A

)

M(A): molar mass of ion A

M(B): molar mass of ion B

M(A

): molar mass of substance A

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 65 66

Comments to this Manuals

No comments

Metrohm 765 Dosimat User Manual Page 18

Comments to this Manuals

Related products and manuals for Equipment Metrohm 765 Dosimat