Conjugate acid-base pairs

Write the formula of the conjugate base of any acid (remove H+) and the conjugate acid of any base (add H+), and identify the two conjugate pairs in an acid-base reaction equation.

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What is the conjugate acid of the hydrogen phosphate ion, $\ce{HPO4^2-}$ ? A. $\ce{PO4^3-}$ B. $\ce{H2PO4-}$ C. $\ce{H3PO4}$ D. $\ce{HPO3^2-}$

Sulfurous acid has the formula $\ce{H2SO3}$ . (i) Using the concept of formal charge, outline why Lewis formula 2 is the more stable, preferred structure. (ii) Write the formula for the conjugate base formed from sulfurous acid.

Methanoic acid, $\ce{HCOOH}$ , is a weak acid, and solutions of it are often used as acidic buffers. A chemist prepared a $0.500\ \mathrm{mol\,dm^{-3}}$ solution of methanoic acid, in which two conjugate acid–base pairs are present. (i) For each pair, state the…

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