H₂SeO₃ is weaker acid than H₂SeO₄
The size of the "SeO₄" atom typically has an impact on an acid's bond strength; the stronger the H-A bond, the smaller the "SeO₄" atom. As you move down a row in the Periodic Table, the atoms get bigger and the bonds get weaker, strengthening the acids.
<h3>What is acid?</h3>
An acid is a chemical compound, typically a liquid, that contains hydrogen and has the ability to react with other compounds to produce salts. When they come into touch with other materials, some acids can dissolve or burn them.
A substance is considered an acid if it tastes sour in aqueous solution, turns blue litmus paper red, reacts with some metals to release hydrogen, reacts with bases to produce salts, and fosters chemical reactions (acid catalysis).
In water, nonmetal oxides dissolve and produce acids. In the same way that SO3 produces sulfuric acid when it dissolves in water, P4O10 combines with water to produce phosphoric acid. In contrast, bases are metal oxides. Formally, metal oxides include the O2- ion, which, when combined with water, yields two OH- ions.
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