Acid-base titration combined with indicators is a method in analytical chemistry for the preliminary assessment of corresponding solutions. During this experiment, the students create a measurement curve for a titration of a strong acid vs. a strong base. On top of that, the students will identify the titration curve's characteristics and determine the equivalence point.
In this experiment a strong acid (here: hydrochloric acid, 0.1 M) of unknown concentration but known volume is filled into a vessel. The pH electrode, after being calibrated, will be connected to the Cobra4 Mobile-Link to determine the pH value of the acid. The solution of a strong base with known concentration (here: sodium hydroxide, 1 M) is filled into the burette. The base is added in 1 ml steps to the acid, the pH value will be determined after every step. The equivalence point is determined with a suitable indicator (here: bromothymol blue).
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