Question

the purpose of a catalyst is... to increase the equilibrium amount of products. to increase the reaction rate. to increase the number of products formed. to make a reaction endothermic.

Explanation:

A catalyst speeds up a chemical reaction by lowering the activation - energy barrier. It does not affect the equilibrium position (so it doesn't change the equilibrium amount of products or the number of products formed at equilibrium), nor does it change whether a reaction is endothermic or exothermic.

Answer:

to increase the reaction rate.