Heat of Dilution

Chemistry ⇒ Thermochemistry and Energetics

Heat of Dilution 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 Dilution. 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 solution of 0.5 M H₂SO₄ is diluted to 0.1 M. If the enthalpy change is -3 kJ per mole, what is the heat of dilution?

A solution of 1 M acetic acid is diluted to 0.1 M. The enthalpy change is +1.2 kJ per mole. Is the process endothermic or exothermic?

A student adds 50 mL of water to 50 mL of 2 M HCl and observes a temperature increase. What does this indicate about the heat of dilution for HCl?

Describe how the heat of dilution can affect the temperature of a solution during dilution.

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

Describe the main reason why the heat of dilution for weak electrolytes is significant.

Describe the process of measuring the heat of dilution in a laboratory setting.

Explain why the heat of dilution for a strong electrolyte approaches zero at infinite dilution.

Explain why the heat of dilution for NaCl is very small compared to that for CH₃COOH.

Explain why the heat of dilution for strong acids like HCl is nearly zero at high dilution.

Explain why the heat of dilution is important in industrial processes involving concentrated acids or bases.

If 100 mL of 2 M NaCl is diluted to 1 M by adding water, and the enthalpy change is -0.5 kJ, what is the heat of dilution per mole of NaCl?

If the enthalpy of a 2 M solution is -5 kJ and that of a 1 M solution is -7 kJ, what is the heat of dilution when diluting from 2 M to 1 M?

If the heat of dilution is negative, what does this indicate about the process?

When 1 mole of H₂SO₄ is diluted from 5 M to 1 M, the enthalpy change is -10 kJ. What is the heat of dilution per mole?

A 100 mL solution of 3 M NH₄Cl is diluted to 1 M at 25°C. The enthalpy of the 3 M solution is -8.0 kJ and that of the 1 M solution is -10.5 kJ. Calculate the heat of dilution per mole of NH₄Cl for this process.

A chemist records the following enthalpy values: 2 M KOH solution: -6.2 kJ; 0.5 M KOH solution: -8.0 kJ. If 200 mL of 2 M KOH is diluted to 0.5 M, calculate the total heat change observed during the dilution.

Discuss how the heat of dilution would differ if a solution is diluted at 0°C compared to 25°C, and explain the thermodynamic reasons for any difference observed.

Explain, at the molecular level, why the heat of dilution for a weak electrolyte such as CH₃COOH is significantly greater than that for a strong electrolyte like NaCl.