Titration of a vinegar with a pH meter
A producer has sent you a batch of vinegar. Determine its acetic acid concentration using sodium hydroxide of known concentration.
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A quality-control mission
A producer has sent you a batch of vinegar. Determine its acetic acid concentration using sodium hydroxide of known concentration.
Your result must come from your measurements. The unknown value is revealed only after your analysis.
Listen to / read the lab guidance
A producer has sent you a vinegar sample. Your task is to measure its acetic acid concentration. Prepare a dilution, build a titration curve, and defend your result.
Protocol and completed steps
- 01A quality-control mission
- 02Prepare a reliable titration
- 03Make a prediction
- 04Read the instruments
- 05From signal to concentration
- 06A result you can defend
YOUR MEASUREMENTS, YOUR EVIDENCE
Build the curve yourself.
Every point comes from a stable reading you recorded.
Close the tap, wait for stabilization, then record the instruments. Points are never added automatically.
Scientific model and assumptions
Monoprotic acetic acid in an ideal solution at 25 °C. pKa = 4.76; pKw = 14. The model solves acid–base equilibrium and charge balance after each addition, with additive volumes. Added water and 0.10 mL indicator are included; indicator acid/base consumption is neglected. The meter is calibrated before the session and takes a few seconds to respond. Ionic activities and CO₂ absorption are not simulated.