What is the conjugate base of OH-? - DASH

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Question

What is the conjugate base of OH^-?

O₂

H₂O

O^-

O^-2

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Step-by-Step Explanation Step 1: Understanding Conjugate Acid-Base Pairs A conjugate acid-base pair consists of two substances that differ by a single proton ($H^+$). When an acid loses a proton, it becomes its conjugate base. Conversely, when a base gains a proton, it becomes its conjugate acid. Step 2: Identifying OH⁻ as the Acid or Base In this context, $OH^-$ can act like a base or an acid depending on the reaction partner. We are asked to find its conjugate base, so we must imagine $OH^-$ losing a proton ($H^+$). Step 3: Removing a Proton from OH⁻ If $OH^-$ loses one proton ($H^+$), the remaining species is $O^{2-}$. Symbolically this can be represented as: $OH^- \rightarrow O^{2-} + H^+$ Step 4: Concluding the Conjugate Base Therefore, the species formed by removing one proton from $OH^-$ is $O^{2-}$. Hence, $O^{2-}$ is the correct conjugate base of $OH^-$.

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