Processing kodak motion picture films, module 3 analytical procedures

CALCULATIONS
Na2SO3 , g/L = (mL B – mL A) x (N Na2SO3 ) x (eq. wt.) x (1000)
(mL sample) x (1000)
Where:
Example:
= (mL B – mL A) x (N Na 2SO 3) x (63.02) x (1000)
(3) x (1000)
mL A = mL of Na2SO3 consumed by sample
mL B = mL of Na2SO3 consumed by blank
N Na2SO3 = Normality of Na2SO3 in milleq./mL used
for titration
eq. wt. Na2SO3 = 63.02 mg/meq
mL sample = 3.0 mL
1000 = factor to convert mg to g in the numerator
and mL to L in the denominator
Na2SO3 , g/L = (40.32 – 21.98) x (0.0996 N Na2SO3) x (63.02) x (1000)
(3)(1000)
= 38.4 g/L Na 2 SO 3
Processing KODAK Motion Picture Films, Module 3, Analytical Procedures H24.03 3