Respuesta :
The conjugate acid pair for H₂PO⁻ is HPO₄²⁻, and the conjugate base pair for OH⁻ is H₂O .
In this equation, the aqueous species the equation will dissociate in water.
NaOH → Na + OH⁻
NaH₂PO → Na + H₂PO⁻
Na₂HPO₄ → Na₂ + HPO₄²⁻
So, the new equation forms
Na + OH⁻ + Na + H₂PO⁻ ⇆ H₂O + Na₂ + HPO₄²⁻
We can exclude the sodium ions from the ionic equations because they will only act as spectator ions.
OH⁻ + H₂PO⁻ ⇆ H₂O + HPO₄²⁻
First, we must determine which is the acid and which is the base. Bases are the proton acceptor, while acids are the proton donor.
In this situation, it is clear that H₂PO⁻ gave its proton to OH⁻ to create H₂O and HPO₄²⁻. Thus, H₂PO⁻ is the acidic and OH⁻ is the basic.
Acid = H₂PO⁻
Base = OH⁻
Conjugate Acid = HPO₄²⁻
Conjugate Base = H₂O
What is spectator ion?
Spectator ions are ions that are present on both sides of chemical reactions but do not take part in the reaction itself. The spectator ions on both sides of the equation are cancelled in the net chemical reaction. So, to "spectate" is to "see" the other ions in an aqueous solution interact with one another.
The information about the ions present in an aqueous medium is provided by the net ionic equation. Salts are present as cations and anions in the dissolved state when they are dissolved in polar solvents like water.
The chemical species that change chemically are identified by the net ionic equation. As a result, they are referred to as spectator ions since the ions that appear on both sides of the equation are constant.
Learn more about Spectator ions
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