Answer :
The conjugate acid pair for H₂O is OH⁻, and the conjugate base pair for HS⁻ is H₂S⁺ .
First, we must determine which is the acid and which is the base. Bases are the proton acceptor, while acids are the proton donor.
H₂O + HS⁻ ⇆ OH⁻ + H₂S
In this situation, it is clear that H₂O gave its proton to HS⁻ to create OH⁻ and H₂S. Thus, H₂O is the acidic and HS⁻ is the basic.
Acid = H₂O
Base = HS⁻
Conjugate Acid = OH⁻
Conjugate Base = H₂S⁺
What are conjugate pairs?
The Bronsted-Lowry acid-base theory states that a conjugate acid is a chemical compound that is produced when an acid donates a proton (H+) to a base. In other words, the base has had a hydrogen ion added to it, as in the opposite reaction, the base loses a hydrogen ion.
Contrarily, a conjugate base is what is left over when an acid contributes a proton during a chemical reaction. As a result, since it can gain a hydrogen ion in the inverse reaction, a conjugate base is a species that is generated by taking a proton out of an acid.
Since some acids have the ability to release a large number of protons, the conjugate base of an acid might likewise be acidic.
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