Question

What will be the outcome of putting litmus paper into a mixture of equal amounts of soap and tomato juice?

Answer 1

Hmm...since soap is alkaline and tomato juice is acidic (the internet says the pH is 4.smth so yea) so the mixture would be neutral. Thus, the litmus paper would be purple

Answer 2

There are different types of litmus papers; red, blue, and purple are the most common. Most likely the mixture between soap and tomato juice will have a neutral pH or close to neutral, therefore the color indicated by litmus paper should indicate that of a neutral solution which for those mentioned wouldn't be too clear. The best option will be using a universal indicator instead which will show a green color when neutral. Red litmus paper turns blue when placed in a basic solution. Blue litmus paper turns red in an acidic solution, but none of them will show a clear color when placed in a neutral solution.