If changing variable A causes variation in variable B, then variable A is identified or described by researchers as what variable? More specifically, is variable A associated with the cause or the effect, the independent or the dependent variable?

The answer is the position of equilibrium lies far to the right, with products being favored.
The dissociation of a base may be written as:
AB ↔ A⁺ + B⁻

If the base is strong, it will dissociate into ions completely. This means that the equilibrium constant for the forward reaction will be greater than that for the backward reaction, and the equilibrium position is far to the right.