Heat of Solution

Chemistry ⇒ Thermochemistry and Energetics

Heat of Solution starts at 11 and continues till grade 12. QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Heat of Solution. How you perform is determined by your score and the time you take. When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.

See sample questions for grade 11

A solution is prepared by dissolving 20 g of KCl (ΔH_solution = +17 kJ/mol, molar mass = 74.5 g/mol) in water. Calculate the heat absorbed.

A student dissolves 5 g of NH₄Cl (ΔH_solution = +15 kJ/mol, molar mass = 53.5 g/mol) in water. Calculate the heat change.

A student observes that the temperature of a solution increases when a salt is dissolved. What can be inferred about the sign of the heat of solution?

Calculate the heat absorbed when 10 g of KNO₃ (molar mass = 101 g/mol, ΔH_solution = +34 kJ/mol) is dissolved in water.

Calculate the heat change when 0.2 mol of NaCl (ΔH_solution = +3.9 kJ/mol) is dissolved in water.

Define the term 'enthalpy of hydration'.

Describe how you would experimentally determine the heat of solution of a salt.

Describe the difference between heat of solution and heat of hydration.

Describe the steps involved in the dissolution of an ionic compound in water in terms of energy changes.

Explain the effect of temperature on the heat of solution for gases dissolving in liquids.

Explain why dissolving CaCl₂ in water increases the temperature of the solution.

Explain why the dissolution of some salts is endothermic while others are exothermic.

Explain why the heat of solution for a salt may change with concentration.

Explain why the heat of solution for NaCl is small compared to that of KNO₃.

If the enthalpy of hydration of Na⁺ is -406 kJ/mol and that of Cl⁻ is -363 kJ/mol, what is the total enthalpy of hydration for NaCl?

If the lattice energy of KCl is 701 kJ/mol and the hydration energy is -715 kJ/mol, what is the heat of solution?

The dissolution of NaOH in water is highly exothermic. What is the sign of its heat of solution?

What is meant by the term 'heat of solution'?

When ammonium nitrate dissolves in water, the temperature of the solution decreases. What does this indicate about the heat of solution?

A chemist dissolves 25 g of LiBr (molar mass = 86.8 g/mol, ΔH_solution = -48.8 kJ/mol) in water at 25°C. Calculate the heat released or absorbed during the dissolution process.