Dreaming of acid attack is a kind of warning as per dream interpretation and meaning. You need to be extra careful after an acid attack dream especially about your friends and acquaintances.
You should not travel alone or walk in lonely places after seeing such a dream.
It is also a kind of warning to avoid making friends with strangers. You should also avoid encouraging people with your attitude.
The dream is also asking you to be firm and bold when confronted by strangers.
Today it is very common to see dreams of acid attack as many people see such things in news or on movies. Dreaming of it after witnessing an intense incident does not have any value as it is just a mere extension of what happened during the daytime. The dream to have a meaning it should happen naturally not under influence of daytime activity.