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COLOR FILM DEVELOPERS AND BLEACH
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milliliter Erlenmeyer flask containing 100 milliliters of distilled water and 5 milliliters of concentrated hydrochloric acid. Titrate the iodine solution with the developer until the iodine color is nearly discharged. Add 3 milliliters of starch solution and continue the titration until the solution becomes colorless.
Grams of sodium sulfite per liter =
milliliters of iodine X normality of iodine X 63 milliliters developer required
Determination of Sodium Bisulfite in Developer A-605
Place a portion of the developer in a 25-milliliter buret. Pipet 5.0 milliliters of approximately 0.1 normal iodine solution into a 250milliliter Erlenmeyer flask containing 100 milliliters of distilled water and 5 milliliters of concentrated hydrochloric acid. Titrate the iodine solution with the developer until the iodine color is nearly discharged.
idd 3 milliliters of starch solution and continue the titration until the
>lution becomes colorless.
Grams of sodium bisulfite per liter =
milliliters of iodine X normality of iodine X 52 milliliters developer required
Determination of Sodium Carbonate
Pipet a 20.0-milliliter sample of developer into a 250-milliliter Erlenmeyer flask containing 100 milliliters of distilled water and 4 drops of methyl orange-indigo carmine indicator.* Titrate with approximately 1 normal hydrochloric acid to the gray end-point.
Grams of sodium carbonate monohydrate per liter A-502 = milliliters HC1 X normality HC1 (0.159 X grams Na2SO3 per liter)
0.323
Grams of sodium carbonate monohydrate per liter A-605 = milliliters HC1 X normality HC1 0.323
* The mixed indicator is prepared by dissolving 0.1 gram methyl orange and 0.25 gram indigo carmine in 100 milliliters of water. The end point is taken as the neutral gray color which occurs between the alkaline green and the acid violet shades. Bromphenol blue may be used in place of the mixed indicator, but the dichroic red-yellow end point is more difficult to see.