position of equilibrium

In water, ethylamine sets up an equilibrium with water, and that equilibrium lies well to the left, so only a small fraction of the molecules are protonated at any moment.

Estimated from the magnitude of Kc, it lies to the right when products dominate and to the left when reactants dominate, rather than the reaction going to completion.

It shifts in a direction, to the left or to the right, or towards a named side, and the principle predicts direction only, never how far or how fast.

For a weak acid the equilibrium lies well to the left, as typically fewer than two molecules in a hundred have donated a proton at any moment.

Because these are equilibria, the reaction need not go to completion, and the position tells you about relative strengths.

Shifted towards the product when a volatile product is removed as it forms, as in an esterification.