Version: 01 Doc.-No.: 5200 Page: 7 / 7 Released on: Released by: 10.11.2011
Procedure for pH-Titration indicated by Bromocresol green •
2.0** ml of sample solution are given into a suitable beaker
the solution is filled up to approx. 100 mL with DI water
immediately before titration 100 µL of Bromocresol green indicator solution is added and
the solution is titrated with 0.1 M HCl standard solution from blue to yellow.
Calculation: The volume in ml of 0.1 M hydrochloric acid standard solution***, multiplied by 4.11, gives the content of
Uniclean 284 in g/l.
The volume in ml of 0.1 M hydrochloric acid standard solution***, multiplied by 0.411, gives the content of
Uniclean 284 in %(v/v).
Example: During the titration of 2.0 mL sample, 12.94 mL of 0.1 M HCl standard solution*** was used.
= 4.11 · 12.94 = 53.2 g/L Content
= 0.411 · 12.94 = 5.3 % Quality assurance: For maintenance, calibration of measuring devices and the use of standards and reference materials please refer to the corresponding guidelines. *
Unless otherwise stated, these are always analytical grade substances.
Volumes given exact to a decimal point must be measured with a volumetric pipette.
*** For the purpose of calculation, the factor of the standard solution is assumed to be 1.000 and is
therefore not taken into account in the examples.
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