Sulfuric Acid Measurement: Simple, Reliable Titration Methods

Summary for sulfuric acid measurement Discussion

Sulfuric acid measurement in this thread is answered with simple acid-base titration methods. John Martin recommends pipetting a 1 ml sample into a flask, diluting it with 100 ml water, adding methyl orange, and titrating with 1.0N NaOH to a yellow endpoint; he says to calculate % acid as ml of 1N NaOH × 2.5. Teody Delgado offers a second approach: weigh 1 gram of sample, add 100 ml deionized water, use phenolphthalein, and titrate with 1.0N NaOH, then calculate with volume of titrant × 4.904 / weight. The original question from Fredy Lie asks how to measure the composition of sulfuric acid for an aluminium extrusion factory. The thread presents practical lab titration formulas rather than instrumental analysis, and the two answers differ mainly in sample handling and indicator choice.