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By titrating with sodium hydroxide standard solution, sulfuric acid and aluminum ions contained in aluminum processing liquid for plating can be determined. In this titration, two inflection points are defined; the first point indicates the sulfuric acid content and the titrant consumption between first to second end points indicates the amount of aluminum ions according to the formulae 1 and 2 as shown below. H2SO4 + 2NaOH Na2SO4 + 2H2O … formula 1 Al3+ + 3NaOH 3Na+ + Al(OH)3 … formula 2
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