I do the thing Chad did in his video were you examine each one so like
NaBr both of those are negligible so its neutral
LiBr both of those are also negligible so overall neutral
AlCl3 The Cl is negligible but the Al is considered acidic.. so entire thing is Acidic
KF The K is negligible but the F is basic so entire thing basic
its asking for pH less than 7 aka acidic so only one that was acidic was the AlCl3 hope that makes sense. the water crossing thing they do works too if u get it but i find this easier.
looking at cation: group 1 (on the periodic table) ? cross it out
group 2 ? cross it out
looking at anions: came from a strong acid? like a Cl- that would have came from HCl? cool, cross it out
the things not crossed out are what the solution is. so like NaBr, I'll cross Na because its group one and I'll cross Br, because it came from HBr, both are crossed out, so its neutral.