Example Potentiometric Calculations:
Titration |
| mL 0.1 N Na2S2O3 Titrant |
Blank A | = | 40.50 |
Sample A | = | 21.85 |
Blank B | = | 40.55 |
Sample B | = | 19.80 |
Hypo Index (HI) or Total Reductants:
(40.50 – 21.85)(0.0989)
HI (1), mL =
0.1000
= 18.4 mL 0.1000 N I2
Thiosulfate (S2O3=):
g/L S2O3= =
(40.55 – 19.80)(0.0989)(112.13)(1000)
(2.0)(1000)
= 57.5 g/L
Sodium Sulfite (Na2SO3):
[(40.50 – 21.85)(2.0) – (40.55 – 19.80)](0.0989)(63.02)(1000)
g/L Na2SO3 =
(2.0)(1000)
= 51.4 g/L
Processing KODAK Motion Picture Films, Module 3, Analytical Procedures • H24.03 | 9 |
