A number of difference forces are involved in producing sound when a bubble pops, and the exact noise depends on the chemical properties of the soap film
Source:
https://www.newscientist.com/article/2238125-weve-figured-out-why-bubbles-make-a-pop-sound-when-they-burst/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home