In the case of mixing a strong acid and a strong base, each of 1 M concentration, when does the highest temperature rise occur?
Correct answer: C. 25 ml acid and 25 ml alkali
- A. 20 ml acid and 30 ml alkali
- B. 10 ml acid and 40 ml alkali
- C. 25 ml acid and 25 ml alkali
- D. 35 ml acid and 15 ml alkali
Explanation
The heat released is maximized when the maximum number of moles of acid and base react. With equal concentrations, mixing equal volumes (25 ml each) ensures a complete stoichiometric reaction, releasing the most heat and causing the highest temperature rise.
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Thermochemistry measures energy changes in chemical reactions and distinguishes exothermic from endothermic processes. Work covers systems, surroundings and state functions, internal energy, the first law of thermodynamics, enthalpy and Hess's law, including the sign conventions used when heat enters or leaves a system.
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