A haloacid is with the formula HXO₄ is purified and titrated with a strong base. The acid had a strong tendency to decompose into various gases including O₂, particularly at high concentrations in the presence of base.

Figure 1. Titration of dilute haloacid acid with a 0.10 M strong base.

Researchers produced variants of the haloacid with other halides, nonmetals, and metalloids. They theorized that the electronegativity of the oxygen-complexed central atom, such as a halogen, would determine both the acidity and the tendency to decompose in the presence of a base.

The same effect was difficult to recreate with bases, since the conjugate acids of the strong bases tested were monoatomic. Such bases had the formula M(OH)_x and their solubility varied considerably depending on the metal used.
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