Why meta boric acid and tetra and pyro boric acids are unstable in solution?

Answer 1

It's only stable form can be found in tetra-min fish food and pyro-tech fireworks.

Answer 2

Meta boric acid, tetra boronic acid, and pyroboric acids are unstable in solution due to their tendency to polymerize and form complex borate species. This process occurs more readily in aqueous solutions, leading to the formation of insoluble products which results in instability and precipitation. Additionally, the formation of borate complexes alters the pH of the solution, making it difficult to control the stability of these boron compounds.