Salts which dissolve in water with evolution of heat. The effect of temperature on their solubility will be:
Correct answer: B. Decreases with increase in temperature
- A. Increases with increase in temperature
- B. Decreases with increase in temperature
- C. Solubility does not change
- D. In some cases it increases while in others it decreases
Explanation
In exothermic reactions, heat energy is released when the solute dissolves in a solution. Increasing temperature introduces more heat into the system. Following Le Chatelier's Principle, the system will adjust to this excess heat energy by inhibiting the dissolution reaction. Increasing temperature, therefore, decreases the solubility of the solute. An example of a solute that decreases in solubility with increasing temperature is calcium hydroxide, which can be used to treat chemical burns and as an antacid.
This question appeared on the ETEA MDCAT 2015 paper, which you can sit online with every answer explained.
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About Solubility Product
The solubility product constant, Ksp, represents the equilibrium concentrations of ions from a sparingly soluble salt, each raised to its stoichiometric power. Problems involve writing Ksp expressions, calculating molar solubility, applying the common-ion effect and predicting precipitation from the ionic product.
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