For purposes of predicting changes in equilibrium, heat canalso be thought of as

Question

For purposes of predicting changes in equilibrium, heat canalso be thought of as a reactant or product. This factaffects the solubility of ionic compounds in solvents such aswater. Some salts, such as sodium hydroxide release heatenergy when they dissolve: NaOH(s) --> Na+(aq) +OH--(aq) + Heat   (exothermic) Other salts, such as potassium nitrate, absorb energy duringthe dissolving process: KNO3(aq) + Heat --> K+(aq)+ NO3--(aq)   (endothermic) While all salts dissolve faster when a solutintemperature increases, not all salts become more soluble as thetemperature increases. a) does the solubilityof sodium hydroxide(NaOH) increase as the temperature of thesolution is increases, or does it decrease? Explain your answer interms of Le Chatelier's Principle. b)Does solubility ofpotassium nitrate (KNO3) increase as the temperature ofthe solution is increased, or does it decrease? Explain your answerin terms of Le Chatelier's Principle. For purposes of predicting changes in equilibrium, heat canalso be thought of as a reactant or product. This factaffects the solubility of ionic compounds in solvents such aswater. Some salts, such as sodium hydroxide release heatenergy when they dissolve: NaOH(s) --> Na+(aq) +OH--(aq) + Heat   (exothermic) Other salts, such as potassium nitrate, absorb energy duringthe dissolving process: KNO3(aq) + Heat --> K+(aq)+ NO3--(aq)   (endothermic) While all salts dissolve faster when a solutintemperature increases, not all salts become more soluble as thetemperature increases. a) does the solubilityof sodium hydroxide(NaOH) increase as the temperature of thesolution is increases, or does it decrease? Explain your answer interms of Le Chatelier's Principle. b)Does solubility ofpotassium nitrate (KNO3) increase as the temperature ofthe solution is increased, or does it decrease? Explain your answerin terms of Le Chatelier's Principle. While all salts dissolve faster when a solutintemperature increases, not all salts become more soluble as thetemperature increases. a) does the solubilityof sodium hydroxide(NaOH) increase as the temperature of thesolution is increases, or does it decrease? Explain your answer interms of Le Chatelier's Principle. b)Does solubility ofpotassium nitrate (KNO3) increase as the temperature ofthe solution is increased, or does it decrease? Explain your answerin terms of Le Chatelier's Principle.

Explanation / Answer

A) This is an exothermic reaction. Increasing this temperature willcause the equilibrium to move to the left. This is because LaChatleier's principle says the equilibrium will move to minimizeany changes. We want to use up the heat and produce more NaOH.Therefore it decreases the solubility, because the reaction ismoving more to the left, not to the right, so it doesnt get achance to dissolve. B) This is an endothermic reaction, adding heat will cause theequilibrium to move to the right. (We want to use up that excessheat). Thus, more KNO3 will form its K+ and NO3 - ions. Thus, itssolubility increases.

Related Questions

Navigate

• Browse (All)
• Browse F
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.