Reversible reactions - A reaction in which reactants combine to form products and the products can also react to form the original reactants

Symbol - ⇌

adding water to cobalt chloride and CuSO4 releases heat

Equilibrium -

Closed System - Nothing enters or leaves the reaction

How equilibrium works -

1. High concentration of reactants leads to highest rate of reaction
2. As products form the products start reacting and they soon have a higher rate of reaction due to the products having a higher concentration
3. This leads to the forward rate of reaction to decrease and the backward rate of reaction to slowly increase till they are the same

Equilibrium Position - Rate of forward reaction and rate of backward are equal and concentration of reactants and products are constant

Le Chateliers Principle - When conditions of a system at equilibrium change then the system automatically moves to oppose the change