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P.O. Box 1606, Palmer Lake, CO 80133
Tel: (719) 488-9640, Fax: (866) 453-8473
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Peroxy-Sulfuric Etching Module
Chemical Analysis/Sulfuric Acid Analysis
Sulfuric Acid Analysis
- Titration flask (125 ml)
- 10 ml Automatic pipette
- Digital titrator
- Deionized water
- Bromphenol blue indicator
- 1.60N Sodium hydroxide (titrant)
If 35% sulfuric acid (automotive battery grade) is used to increase the acid content, use:
- Measure 30 ml of deionized water into the titration flask. (Quantity is not critical)
- Using the automatic pipette, add .10 ml of sample solution.
- Add one drop of bromphenol blue indicator to the flask. Swirl the flask around to mix thoroughly. The solution will turn a light yellow color with the addition of the indicator.
- Using the digital titrator, titrate with 1.60N sodium hydroxide until the solution turns light blue. Record the number of drops of titrant used as indicated on the digital readout.
- The amount of sulfuric acid that is needed for a bath with volume=V (liters) can be calculated using the relationship below (the digital titrator reading is denoted NumSulf).
Liters of H2SO4 needed = [0.10 - (0.000535 x NumSulf)] x V / 0.35
If 98% sulfuric acid (concentrated plating grade) is used to increase the acid content, use:
Liters of H2SO4 needed = [0.10 - (0.000535 x NumSulf)] x V / 0.98
To express the concentration of sulfuric acid as a percent of bath volume, use:
% H2SO4 = 0.0535 x NumSulf
The acceptable range of NumSulf is:
||8 to 10%
||150 to 187
HANDLE WITH CARE
Always wear protective clothing, acid resistant gloves,
and a full coverage face shield when handling this or any other corrosive material.
If contact should occur, flush affected area with cool tap water for 15 minutes.
CONTACT A PHYSICIAN IMMEDIATELY.
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