This is an experiment about the diffusion of the sodium phthalate phenolpthalein agar blok and the sulphuric acid, here are some questions which I dont`t know the exact answer:

1. What evidence is there that sulphuric acid diffuses into the agar block?

2. In what ways is using agar cubes as a model of a cell to examine the movement of substances limited?

3.What additional experiment could you do with agar to expand your knowledge of this topic?