An unusual category of acids known as superacids, which are...

An unusual category of acids known as superacids, which are defined as any acid stronger than $100 \%$ sulfuric acid, can be prepared by seemingly simple reactions similar to the one below. In this example, the reaction of anhydrous HF with $\mathrm{SbF}_{5}$ produces the superacid $\left[\mathrm{H}_{2} \mathrm{~F}\right]^{+}\left[\mathrm{SbF}_{6}\right]^{-}$ : $$ 2 \mathrm{HF}(l)+\mathrm{SbF}_{5}(l) \longrightarrow\left[\mathrm{H}_{2} \mathrm{~F}\right]^{+}\left[\mathrm{SbF}_{6}\right]^{-}(l) $$ a. What are the molecular structures of all species in this reaction? What are the hybridizations of the central atoms in each species? b. What mass of $\left[\mathrm{H}_{2} \mathrm{~F}\right]^{+}\left[\mathrm{SbF}_{6}\right]^{-}$ can be prepared when $2.93 \mathrm{~mL}$ anhydrous HF (density $=0.975 \mathrm{~g} / \mathrm{mL}$ ) and $10.0 \mathrm{~mL} \mathrm{SbF}_{5}$ (density $=3.10 \mathrm{~g} / \mathrm{mL}$ ) are allowed to react?

An unusual category of acids known as superacids, which are defined as any acid stronger than $100 \%$ sulfuric acid, can be prepared by seemingly simple reactions similar to the one below. In this example, the reaction of anhydrous HF with $\mathrm{SbF}_{5}$ produces the superacid $\left[\mathrm{H}_{2} \mathrm{~F}\right]^{+}\left[\mathrm{SbF}_{6}\right]^{-}$ :
$$
2 \mathrm{HF}(l)+\mathrm{SbF}_{5}(l) \longrightarrow\left[\mathrm{H}_{2} \mathrm{~F}\right]^{+}\left[\mathrm{SbF}_{6}\right]^{-}(l)
$$
a. What are the molecular structures of all species in this reaction? What are the hybridizations of the central atoms in each species?
b. What mass of $\left[\mathrm{H}_{2} \mathrm{~F}\right]^{+}\left[\mathrm{SbF}_{6}\right]^{-}$ can be prepared when $2.93 \mathrm{~mL}$
anhydrous HF (density $=0.975 \mathrm{~g} / \mathrm{mL}$ ) and $10.0 \mathrm{~mL} \mathrm{SbF}_{5}$
(density $=3.10 \mathrm{~g} / \mathrm{mL}$ ) are allowed to react?

Key Concepts

Superacids

Superacids are acids that are stronger than 100% sulfuric acid. They exhibit acidity far beyond that of traditional strong acids, and their behavior is key to understanding reaction mechanisms and protonation reactions in extremely acidic environments.

Molecular Structure Determination

Determining the molecular structures of a compound involves identifying the arrangement of atoms, including the bonding and geometry, based on chemical formula and reactivity. This concept is important for understanding how components interact during a chemical reaction.

Hybridization

Hybridization is the mixing of atomic orbitals to form new hybrid orbitals that can accommodate electron pairs forming bonds. It is used to explain the geometry and bonding properties of the central atoms in molecules, and is crucial in predicting molecular structure and reactivity.

Reaction Stoichiometry

Reaction stoichiometry involves using the balanced chemical equation to relate the amounts of reactants and products. It allows calculation of how much product can be formed from given quantities of reactants, and ensures that mass is conserved in chemical reactions.

Density and Volume Conversions

Density and volume conversions are fundamental in quantitative chemistry, as they allow conversion between the volume of a substance and its mass. This is essential in calculations where reactants are provided in given volumes and densities, enabling accurate stoichiometric computations.

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