Why does adding liquor to root beer stops the foaming and carbonation?


I poured some Malibu rum with coconut liquor into a cup of root beer and the foaming that normally shows up on top disappeared to become a flat drink. Where did all the foam and carbonation go? The Malibu has sugar and vodka inside

In: Chemistry

This has been asked [before](https://www.reddit.com/r/askscience/comments/3t8ky2/why_does_soda_stop_fizzing_when_you_add_alcohol/), with two answers given:

1. Alcohol is better as dissolving CO2 than water so it can hold onto it better and stop the foaming.
2. Alcohol reduces the overall surface tension of the liquid so bubbles are very small and less stable, and escape more easily