Any problem, any reaction.

Try it on your own. (Best answer for your problem is your action)

An Exothermal reaction is a chemical reaction that produces heat making the solution warm or hot. It is the opposite of an Endothemic reaction which makes the solution colder.

It is a solution.

Both "solution for" and "solution to" can be used, but they are used in slightly different contexts. "Solution for" is used when referring to a specific problem or situation that needs a resolution, while "solution to" is used when indicating the answer or resolution to a problem or situation. For example, "We need to find a solution for the traffic congestion" or "We found a solution to the math problem."