Processing kodak motion picture films, module 3 analytical procedures

Titration
1. Titrate the sample potentiometrically according to
Method ULM-0003-01, with standardized 0.05 N
silver nitrate using a 25-mL buret.
Note: The titration may be performed most rapidly in
the beginning where the potential change is the
smallest. Refer to Figures 1 and 2, to determine the
increment size to use in the region of the end point and
the expected potential change in millivolts.
2. Determine the end point using the concentric arcs from
Method ULM-0003-01, Potentiometric Titrations for
Photoprocessing Solutions.
Calculations
NaBr, g/L =
(N AgNO3 )(mL AgNO3 ) x (eq. wt. NaBr) x (1000)
=
(mL sample) x (1000)
(N AgNO 3 )(mL AgNO 3 ) x (102.91) x (1000)
(50) x (1000)
2.058(mL AgNO 3)(N AgNO 3)
=
4 Processing KODAK Motion Picture Films, Module 3, Analytical Procedures H24.03