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 12

A student dissolves 5 g of NH₄NO₃ in 50 g of water and observes a temperature drop. What type of process is this?

Calculate the amount of heat absorbed when 20 g of KNO₃ (molar mass = 101 g/mol, ΔH_solution = +34 kJ/mol) is dissolved in water.

Calculate the heat change when 0.5 mol of KNO₃ (ΔH_solution = +34 kJ/mol) is dissolved in water.

Calculate the heat of solution if 10 g of a salt (molar mass = 50 g/mol) is dissolved in water and the temperature of 100 g of water increases by 2°C. (Specific heat capacity of water = 4.18 J/g°C)

Calculate the heat of solution if the lattice energy of NaCl is +787 kJ/mol and the heat of hydration is -784 kJ/mol.

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

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

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

Explain the effect of temperature on the heat of solution for most salts.

Explain why the dissolution of NaCl in water is only slightly endothermic.

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

If the heat of solution for a salt is negative, what will happen to the temperature of the solution upon dissolution?

If the heat of solution is zero, what can you say about the energy changes during dissolution?

The heat of solution for a salt is -80 kJ/mol. If 0.25 mol of the salt is dissolved, how much heat is released?

The heat of solution for KCl is +17.2 kJ/mol. What will happen to the temperature of the solution when KCl is dissolved in water?

The heat of solution for NaOH is -44.5 kJ/mol. What does the negative sign indicate?

The heat of solution of a salt is +15 kJ/mol. Is the dissolution process endothermic or exothermic?

When 10 g of NaCl is dissolved in 100 g of water, the temperature of the solution decreases. What does this indicate about the sign of the heat of solution?