Predict the direction of the following reaction: HC 2 H 3 O 2 (aq) + H 2 O (liq) ______________ H 3 O + (aq) + C 2 H 3 O 2 – (aq)

Here it says, predict the direction of the following reaction. So here we have acetic acid reacting with water to reduce h three o plus, which is your hydronium ion, plus the acetate ion. Acetic acid is a weak acid. And remember, if you're a weak acid or a weak base, reactants are highly favored. So that means we'd have the larger arrow pointing towards the reactants and a smaller arrow pointing towards the products. The smaller arrow indicates that not much of that product is formed. Here out of the options, the one that looks most like that is option d. So remember, this indicates that we're dealing with the weak species. Whether it's a weak acid or weak base, the reactant side is more favored, and therefore has a larger arrow pointing towards it.