Question

The temperatures of two separate solutions are found to be 20 degrees Celsius. When the solutions are mixed, a precipitate forms and the temperature changes to 18 degrees Celsius:

A) The reaction is exothermic
B) The reaction is endothermic
C) The reaction is in equilibrium
D) The reaction is reversible

Answer 1

The reaction is exothermic.

Step-by-step explanation:

The temperature change indicates that the reaction is exothermic. When the two solutions are mixed and a precipitate forms, the temperature decreases from 20 degrees Celsius to 18 degrees Celsius. This decrease in temperature suggests that heat is being released by the reaction. Therefore, option A) The reaction is exothermic is the correct answer.