A student carries out a titration to find the concentration of a sample of dilute hydrochloric acid. The student: - adds $$\(25.0 \mathrm{~cm}^{3}\)$$ of aqueous potassium hydroxide to the apparatus labelled $$\(\mathbf{A}\)$$ in Fig. 1.1 Fig. 1.1 - adds a few drops of a suitable indicator to the apparatus labelled $$\(\mathbf{A}\)$$ - uses a burette to add dilute hydrochloric acid to the aqueous potassium hydroxide and indicator mixture in the apparatus labelled $$\(\mathbf{A}\)$$. The student observes the colour changes that occur as they add dilute hydrochloric acid from the burette. State one other thing the student should do as they add the dilute hydrochloric acid to the aqueous potassium hydroxide. ................................................................................................................................................ . ..........................................................................................................................................

Answer:

Knowledge points:

Solution: