Hypothesis

Whenever the amount of solute changes we will appreciate a direct relationship between the volume  of the resulting foam structure and the amount of solute (p-nitroaniline) in the solution (p-nitroaniline and hydrosulfuric acid).

Variables

• Dependent variable: The resulting foam structure 
• Independent variable: The amount of p-nitroaniline for each trial
• Controlled variable: Amount of sulphuric acid (5ml), the container in which the reaction takes place and the concentration of the hydrosulfuric acid.