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Based on the answer to Practice Problem \(12.4\), is the energy required for solute separation greater for \(\mathrm{NaCl}\) or \(\mathrm{MgCl}_{2}\) ? Explain.

Short Answer

Expert verified
The energy required for solute separation is greater for MgCl鈧 than for NaCl. This is because the product of the charges of the ions (q鈧 and q鈧) in MgCl鈧 is -4, which has a greater magnitude than the -1 for NaCl. According to the Lattice Energy formula, the energy required for solute separation is directly proportional to the magnitude of the product of the charges of the ions, thus making MgCl鈧 require more energy for separation.

Step by step solution

01

Recall the Lattice Energy Formula

Recall the formula for Lattice Energy: \(LE = \cfrac{k_{c} \cdot q_{1} \cdot q_{2}}{r}\) where LE is the Lattice Energy, k_c is Coulomb's constant, q鈧 and q鈧 are the charges of the ions, and r is the distance between the ions. This formula tells us that the energy required for solute separation is directly proportional to the product of the charges of the ions and inversely proportional to the distance between them.
02

Analyze NaCl's Ionic Bond and MgCl鈧's Ionic Bond

For NaCl, the ionic bond is formed between Na鈦 (+1 charge) and Cl鈦 (-1 charge). Therefore, the product of the charges, q鈧 and q鈧, for NaCl is: \(q_{1} \cdot q_{2} = +1 \cdot -1 = -1\) For MgCl鈧, the ionic bond is formed between Mg虏鈦 (+2 charge) and Cl鈦 (-1 charge). Since there are two chlorine ions for each magnesium ion, the product of the charges for MgCl鈧 is: \(q_{1} \cdot q_{2} = +2 \cdot 2(-1) = -4\)
03

Compare the Energy Required for Solute Separation

We have found that the product of the charges for NaCl is -1, and for MgCl鈧 is -4. According to the Lattice Energy formula, the energy required for solute separation is directly proportional to the product of the charges of the ions. This means that the energy required for solute separation will be greater for the salt with a higher magnitude of q鈧 and q鈧. Since -4 has a greater magnitude than -1, the energy required for solute separation will be greater for MgCl鈧 than for NaCl. Therefore, the answer is that the energy required for solute separation is greater for MgCl鈧 than for NaCl.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Lattice Energy Formula
Understanding the Lattice Energy Formula is key to making sense of the forces that stabilize ionic compounds. Simply put, the formula provides insight into the amount of energy that would be needed to break an ionic solid apart into isolated gaseous ions.

The general formula is given by:
LE = \( \frac{k_{c} \cdot q_{1} \cdot q_{2}}{r} \)

where \(LE\) stands for Lattice Energy, \(k_{c}\) is Coulomb's constant, \(q_{1}\) and \(q_{2}\) represent the charges of the ions involved, and \(r\) is the distance between the centers of the ions. A higher charge and closer proximity (a smaller distance) mean stronger ionic bonds and higher lattice energy. When applied to different compounds, this formula allows us to predict which compound would require more energy to separate its constituents; that's exactly what facilitates the comparison between the lattice energies of different ionic solids, such as NaCl and MgCl鈧 in the given problem.
Ionic Bonds
Ions are atoms or molecules with an electric charge due to the loss or gain of electrons, and the force that holds oppositely charged ions together in a compound is known as an ionic bond.

When exploring ionic bonds, elements from the periodic table often undergo ionic bonding to reach a stable electronic configuration, typically achieving a full outer electron shell. For example:
  • In sodium chloride (NaCl), sodium (Na鈦) donates an electron and becomes a positively charged ion, while chlorine (Cl鈦) accepts an electron, becoming negatively charged. They come together to form NaCl, which has a neutral overall charge.
  • Magnesium chloride (MgCl鈧), however, involves a magnesium ion (Mg虏鈦) bonding with two chloride ions to maintain charge neutrality. Each chloride ion contributes a -1 charge, making a total of a -2 charge to balance the +2 charge from magnesium.
Understanding ionic bonds is crucial for analyzing the strength of interactions between ions, which in turn influences properties like melting points, boiling points, and lattice energy of the compounds.
Solute Separation Energy
Solute separation energy essentially refers to the amount of energy needed to overcome the forces holding solute particles together in order to dissolve the solid into its constituent ions.

This concept is vitally important when studying how ionic compounds interact with solvents. For compounds like NaCl and MgCl鈧, which exhibit ionic bonding, the solute separation energy is closely linked to the Lattice Energy. A higher lattice energy implies more energy is needed to separate the ions, suggesting that the compound is more stable.

In practice, comparing the solute separation energy between NaCl and MgCl鈧 gives us insight into why MgCl鈧's higher charge product results in significantly more energy needed for dissolution. This characteristic also impacts the solubility and dissolution rate; MgCl鈧 takes more energy to dissolve in solvents compared to NaCl, which relates to the stronger ionic bond in the former.

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