Question

Is the soap solution acidic, basic or neutral? How would you verify it?

Answer 1

Generally, soaps and, therefore, soap solutions are basic in nature. This can be easily identified by using the natural indicator turmeric. Bases turn turmeric red.
Prepare a turmeric paste by adding a few drops of water to turmeric powder. Now, take a piece of paper and dip it into the turmeric paste. Allow it to dry in the sunlight. When the paper is completely dried up, add a drop of soap solution on to the paper and observe. The region containing the soap solution turns red, thereby indicating the basic nature of the soap solution.