During this experiment, the students have to determine the unknown concentration of an ammonia solution (solution to be analysed) with the aid of a suitable indicator (here: methyl orange). For this purpose, a known volume of the base is titrated with a volume of a hydrochloric acid solution of a known concentration (standard solution) until the indicator changes colour. The used volume of the standard solution and its concentration are then used to calculate the concentration of the solution being analysed.
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