The heat of solution with calcium chloride is endothermic what will happen to the temperature of the container/flask when calcium chloride is added to water in the container/flask

Answer: the temperature of the container/flask will decrease.

Justification:

1) As stated in the question, the heat of the solution is endothermic.

Endothermic is a process (physical or chemical) in which energy is absorbed from the surroundings by the initial substances to end in the final state.

2) The fact of absorbing heat energy will translate in the decrease of temperature of the surroundings, in this case the container/flask.

Endothermic means it absorb energy from surrounding and its sign is positive so when it absorb this energy the flask or the container become colder