Designing a chemistry experiment and would like some advice
I'm exploring the relationship between hard water and soap bubbles.
I'm using water with varying hardness levels, unfiltered well water, tap water, and distilled. I am using a pure castile soap (since detergent is more effective in hard water than castile soap) which is a pretty basic soap with a couple different oils, sodium hydroxide, sea salt and citric acid for ingredients. My prediction is that as total hardness of water increases, the soap lather height will decrease and there will be visible precipitate because...
I'm wondering if it's worth adding a secchi disk to measure the turbidity (if that's even the correct term) of the water? I'm having trouble with finding a way to measure the cloudiness of the solution... the secchi disk connects to a bio class I took but I'm worried it overcomplicates my experiment, especially since it's only using 150 mL of water for each sample I'm not sure it would even work the way I think it will. I'm probably overthinking everything, it's supposed to be a basic chemistry experiment.