Coke with salt creates and releases carbon dioxide bubbles through a chemical reaction of the coke and salt.
When you take salt and coke and mix them together coke, it changes the balance of the its chemistry and forces the release of carbon dioxide bubbles.
This reaction occurs because the salt overpowers the carbon dioxide and replaces it in the soda.
The carbon dioxide then has nowhere else to go but out, which causes the explosive sensation.
You should not drink coke with salt as it can shut down your kidneys.
Drinking Coke and salt can shut down you kidneys for life , so, avoid it by any means necessary.
A high salt diet will alter the blood sodium balance, causing the kidneys to have reduced function and remove less water resulting in higher blood pressure.
This puts strain on the kidneys and can lead to kidney disease.
A fun experiment with coke is to add Mentos to the coke and it will cause the coke to bubble and explode.
We did this in school for science and adding the Mentos to the coke makes the Coke fizz and explode.