Equipment Required: Titration flask (125 ml) 10 ml Automatic pipettor Digital titrator Reagents Required: Deionized water Bromphenol blue indicator 1.60N Sodium hydroxide (titrant)

Acid Copper Plating Analysis Peroxy-sulfuric Etchant Analysis

Procedure:

1. Measure 30 ml of deionized water into the titration flask. (Quantity is not critical)
2. Using the automatic pipette, add .10 ml of sample solution.
3. 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.
4. 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.
5. 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).