Lead bromide is ...

Lead bromide is ...

• A. Soluble
• B. Insoluble
• C. Soluble at high temperature
• D. Dissolves in acid

Answer: (B)

Solubility in water is determined by how easily water can pull the ions apart from the solid lattice. Lead bromide has a relatively strong ionic lattice, and the energy gained when water hydrates the Pb2+ and Br− ions isn’t enough to overcome that lattice by a large amount at room temperature. As a result, only a small amount dissolves, so it is regarded as insoluble in water. In qualitative solubility rules, most bromide salts are soluble, but lead bromide is one of the exceptions, which is why it stays as a solid when mixed with water. So the best statement is that lead bromide is insoluble.

Solubility in water is determined by how easily water can pull the ions apart from the solid lattice. Lead bromide has a relatively strong ionic lattice, and the energy gained when water hydrates the Pb2+ and Br− ions isn’t enough to overcome that lattice by a large amount at room temperature. As a result, only a small amount dissolves, so it is regarded as insoluble in water.

In qualitative solubility rules, most bromide salts are soluble, but lead bromide is one of the exceptions, which is why it stays as a solid when mixed with water. So the best statement is that lead bromide is insoluble.