[tex]Ka=\frac{[H_2PO_4^- ][H^+]}{H_3PO_4}[/tex] is the equilibrium constant and is equal to products over reactants raised to their coefficients (excluding solids and liquids and only including aqueous and gasses). Hence, option A is correct.
What is equilibrium?
A state of balance between opposing forces or actions.
A number that expresses the relationship between the amounts of products and reactants present at equilibrium in a reversible chemical reaction at a given temperature.
[tex]Ka=\frac{[H_2PO_4^- ][H^+]}{H_3PO_4}[/tex]
K, the equilibrium constant, is equal to products over reactants raised to their coefficients (excluding solids and liquids and only including aqueous and gasses)
Hence, option A is correct.
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