The objective: To what extent does the surface tension of water decrease as the amount of detergent is increased? If adding detergent to distilled water affects its surface tension, then capillary rise will decrease with increasing concentration of detergent. It should reach a point where the addition of detergent no longer affects the height of the solution in the capillary tube.
Methods/Materials
I started with distilled water and continually added small amounts of detegent to the water. I took capillary height readings after each addition of soap. I continued until the capillary height remainded constant even when adding more soap.