The solubilities of CaCrO 4 and PbCrO 4 in water at 25°C are approximately 0.111 g/L and 0.0905 g/L in H 2 O respectively. Based on this information, which compound do you think has the smaller lattice energy?

Here it says the solubility of of calcium chromate and lead 2 chromate in water at 25 degrees Celsius are approximately point 111 grams per liter and point 0905 grams per liter in water respectively. Based on this information, which compound do you do you think has a smaller lattice energy? So remember, there is an inverse relationship between lattice energy and solubility. The smallest lattice energy here would correlate to the highest solubility. So here, who has the larger solubility? Here our calcium chromate is 0.111, whereas our lead 2 chromate is only 0.0905. Since this is the larger solubility, that would mean that calcium chromate would have the lower or smaller lattice energy.

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11. Bonding & Molecular Structure

Lattice Energy

General Chemistry

11. Bonding & Molecular Structure

Lattice Energy

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Multiple Choice

The solubilities of CaCrO₄ and PbCrO₄ in water at 25°C are approximately 0.111 g/L and 0.0905 g/L in H₂O respectively. Based on this information, which compound do you think has the smaller lattice energy?

CaCrO₄

PbCrO₄

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Verified step by step guidance

Understand that lattice energy is the energy required to separate one mole of an ionic solid into its gaseous ions. It is related to the solubility of the compound: the lower the solubility, the higher the lattice energy, because the compound is more stable in its solid form.

Note the given solubilities: CaCrO4 has a solubility of 0.111 g/L, and PbCrO4 has a solubility of 0.0905 g/L. This means that CaCrO4 is more soluble in water than PbCrO4.

Since CaCrO4 is more soluble, it implies that it has a lower lattice energy compared to PbCrO4. This is because it requires less energy to dissolve in water, indicating weaker ionic bonds in the solid state.

Compare the solubility values: CaCrO4's higher solubility suggests it has weaker ionic interactions in the solid state, leading to a smaller lattice energy compared to PbCrO4.

Conclude that based on the solubility data, CaCrO4 has the smaller lattice energy because it is more soluble in water, indicating weaker ionic bonds in the solid form compared to PbCrO4.