A student investigates the movement of acid into different sized blocks of agar. The agar contains the indicator phenolphthalein. This indicator is purple in a pH of greater than 8 and colourless in a pH of less than 8. Two agar blocks of dimensions 2cm × 2cm × 2cm and 1cm × 1cm × 1cm are labelled A and B respectively and placed in separate beakers as shown in Fig. 1.1.
Q1. At the beginning of the experiment the colour of the indicator in the agar was purple. Explain what this colour indicates.
Q2. Explain the colour change of the agar.
Q3. Name the process by which the acid moves into the agar from the solution.
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