Answer:The correct options is, H2O and H3O+
Explanation:
According to the Bronsted Lowry conjugate acid-base pair concept, an acid is a substance which donates protons and a base is a substance which accepts protons.
From the given options, and represents a base-conjugate acid pair.
The balanced reaction will be :H2O +H+ = H3O+
In this, H2O is a base which accepts a proton to form conjugate acid .
Hence, the correct options is,H2O and H3O+
Taking into account the Brønsted-Lowry acid-base theory, the conjugate acid – base pairs are H₂PO₄²⁻/HPO₄⁻ and H₂O/OH⁻.
The Brønsted-Lowry acid-base theory (or the Brønsted-Lowry theory) identifies acids and bases based on whether the species accepts or donates protons or H⁺.
According to this theory, acids are proton donors while bases are proton acceptors. That is, an acid is a species that donates an H⁺ proton while a base is a chemical species that accepts an H⁺ proton from the acid.
So, reactions between acids and bases are H⁺ proton transfer reactions, causing the acid to form its conjugate base and the base to form its conjugated acid by exchanging a proton.
In other words, a conjugate base is an ion or molecule resulting from the acid that loses the proton, while a conjugate acid is an ion or molecule resulting from the base that gains the proton:
acid + base ⇄ conjugate base + conjugate acid
In this case, you know
HPO₄⁻ + OH⁻ → H₂PO₄²⁻ + H₂O
HPO₄⁻ behaves like acid because donates an H⁺ proton while OH⁻ behaves like base because accepts an H⁺ proton from the acid.
So, H₂PO₄²⁻ is the conjugate base of the HPO₄⁻ and H₂O is conjugate acid of OH⁻.
In summary, the conjugate acid – base pairs are H₂PO₄²⁻/HPO₄⁻ and H₂O/OH⁻.
Learn more about the Brønsted-Lowry acid-base theory:
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