If the rate becomes 4-fold times (quadruples) when the concentration of the reactant is doubled, the reaction is the second-order and similarly, the third, the fourth, and the higher orders.

What happens to rate when concentration is tripled?

In a third order reaction with two reactants, if you triple the concentration of one of the reactants, the rate increases by a factor of 3.

What is the order when the rate triples?

Second Order

If you triple the concentration, you multiply the rate by nine. If you halve the concentration, you divide the rate by four, and so on.