Titra
Lab
®
TitraLab 870 Reference Manual
Page 277
8.2 KCl Molar standards
The conductivity of these standards as a function of temperature is given by Kolraugh 1940,
Handbook of Chemistry p. 1211.
A 1M KCl (solution A) is prepared by dissolving 74.59g of KCl in water and diluting to 1 l at
18°C. The specific gravity of such a solution is 1.0449 at 18°C.
The 0.1M KCl (solution B) is obtained by diluting solution A 10 times.
The 0.01M KCl (solution C) is obtained by diluting solution B 10 times.
Most significant conductivity values of solutions B and C as a function of temperature are
reproduced in the table below from Kolraugh table :
A polynomial has been fitted to these values for both standards, giving conductivity C
y
as a
function of temperature:
C
y
: µS/cm
T
m
: °C
a
i
coefficients:
Temperature (°C)
0.1M KCl standard (µS/cm)
0.01M KCl standard (µS/cm)
0
7 150
776
5
8 200
896
10
9 330
1 020
15
10 480
1 147
18
11 190
1 225
20
11 670
1 278
21
11 910
1 305
22
12 150
1 332
23
12 390
1 359
24
12 640
1 386
25
12 880
1 413
30
14 120
1 552
34
15 130
1 667
36
15 640
a0
a1
a2
a3
KCl 0.1 M
(T
m
= 0 to 36°C)
7 150
+209.3
+9.44 10
-1
-5.77358 x 10
-3
KCl 0.01 M
(T
m
= 0 to 34°C)
776
+23.62
+7.5 10
-2
0
3
2
3
2
1
0
m
m
m
y
T
a
T
a
T
a
a
C
×
+
×
+
×
+
=
Summary of Contents for TitraLab 870
Page 1: ...TitraLab 870 pH EP IP EC ISE Titration Workstation Reference Manual D21T060...
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