Question

Among the following weakest conjugate base is

NO3-
CI-
CIO4-
CH3COO-

Answer 1

Answer on Question #41126, Chemistry, Other

Question

Among the following weakest conjugate base is

$$\begin{array}{l} \mathrm{NO_3^-} \\ \mathrm{Cl^-} \\ \mathrm{ClO_4^-} \\ \mathrm{CH_3COO^-} \end{array}$$

Answer

$\mathrm{HClO_4}$ is the strongest inorganic acid among mentioned ones. It means that $K_a$ (acidity constant) is the largest for $\mathrm{HClO_4}$ and equilibrium in the equation:

$$\mathrm{HClO_4} = \mathrm{H^+} + \mathrm{ClO_4^-}$$

is strongly shifted to products of dissociation.

Therefore the affinity of $\mathrm{ClO_4^-}$ to $\mathrm{H^+}$ ion (in other words basicity) is the weakest among mentioned conjugate bases and $\mathrm{ClO_4^-}$ is the weakest conjugate base.

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