UCI International Inc.

Normality Of Ultra Biocid

Summary- A solution of Ultra Biocid is made in distilled water and titrated with a Standardized 0.5N NaOH solution versus a phenolphthalein end point. The end point is a persistent (30 sec) light pink color. This is done to find the Normality of Ultra Biocid before release.

Apparatus
50 mL Burette
125 mL Erlenmeyer flask
Magnetic Stirring Bars
Stirring / Heating Plate
Analytical Balance (+/-- 0.0001)
Burette Holder
Disposable Plastic Pipets
Materials
Distilled Water
Ultra Biocid sample
Standardized 0.5N NaOH Solution
Phenolphthalein Indicator Solution








Acceptable Limits = 16.20 - 16.60 Normal
Target = 16.40 Normal
Density @ (25 C) = 1.45 +/-- 0.02 g/mL
Calculation of the Normality of Ultra Biocid

Normality of 0.5N NaOH solution x Volume (mL) of 0.5N NaOH used
Normality of Ultra Biocid = 1.45 Weight (grams) of Ultra Biocid used

Determination the Normality of Ultra Biocid
1) Obtain a clean, dry 50 mL burette.
2) Place the burette into a burette holder above the stirring plate.
3) Fill the burette above the zero mark with the 0.5N NaOH Solution and drain back to Zero.
Note: This helps to remove any trapped air bubbles in the tip of the burette.
4) Weigh approximately 1.0 grams of Ultra Biocid into a 250 mL flask.
5) Record weight to the nearest 0.0001 grams.
6) To the flask add 26-28 mL of distilled water.
Note: 1mL of distilled water = 1 gram of distilled water
7) Add a magnetic stir bar to the solution and place on stirring plate.
8) Add 2-3 drops of Phenolphthalein solution to the solution.
9) Mix Well
10) Titrate sample with 0.5N NaOH to a persistent light pink end point.
Note: Light pink color must remain at least 30 Sec.
11) Record volume used to the nearest 0.01 mL.
12) Calculate the Normality of Ultra Biocid using the formula below.
13) Record the result.