Think & Tinker Instrument Prototyping

Think & Tinker, Ltd.
P.O. Box 1606, Palmer Lake, CO 80133
Tel: (719) 488-9640, Fax: (866) 453-8473
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Acid-Copper Electroplating Module Model 1000 Manual
Chemical Analysis - Sulfuric Acid Analysis

Sulfuric Acid Analysis

Equipment Required:

Titration flask (125 ml)
Automatic pipette
Digital titrator

Reagents Required:

Deionized water
Bromphenol blue indicator
1.60N Sodium hydroxide (titrant)

Procedure:

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).

If 35% sulfuric acid (automotive battery grade) is used to increase the acid content, use:

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 H 2SO4 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:

Optimum Range:	8 to 10%
NumSulf:	150 to 187

CAUTION

Always use the proper attire as outlined above in the SAFETY section when handling concentrated sulfuric acid. If contact should occur, flush affected area with cool tap water for 15 minutes. CONTACT A PHYSICIAN IMMEDIATELY.

HANDLE WITH CARE

Always wear protective clothing, acid resistant gloves, and a full coverage face shield when handling this or any other corrosive material.

Established 1990

On the web since 1994