Where does the spring's energy go ?

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When a stretched spring dissolves in acid, its stored potential energy is transformed rather than lost. As the spring disintegrates, the energy is converted into kinetic energy of the particles released during the reaction. Additionally, some energy is dissipated as heat due to the chemical reaction and the movement of particles. On an atomic level, the bonds within the spring material break down, releasing energy in the process. Ultimately, the potential energy of the spring is redistributed into kinetic energy and thermal energy in the surrounding environment.
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I can't get my head around this problem : Consider a stretched spring, fixed by string at the both ends to a bottle. The bottle is filled with a certain acid, that only eats away the spring and not the string.

Assume the ideal conditions - the whole spring gets dissolved completely at the same time. Where does the potential energy go ?

There is an overview of the problem in the attachment.
 

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Kinetic energy in the products of the reaction.
Heat and so on as well.

You should consider how energy gets stored in the spring, and what actually happens when acid dissolves it... on the atomic level.
 

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