✅ Resolución Examen PAU julio DANA 2025 de Química. Ejercicio 4. REDOX y ÁCIDO BASE

📝 Find the solutions to the complete exams on our website 👉 https://academialallibreta.es/examene... 🟩 Academia La Llibreta https://academialallibreta.es/ 🔴 YouTube https://cutt.ly/MnXnwaA 🔵 Facebook   / academialallibreta   🟠 Instagram   / academialallibreta   ✅ PAU Exam Solution July 2025 DANA Chemistry. Exercise 4 - REDOX and ACID-BASE In aqueous solution, hydrogen peroxide, H₂O₂, reacts with hydrochloric acid, HCl, to produce molecular chlorine, Cl₂, and water, H₂O. a) Write the balanced chemical equation. (0.4 points) b) Justify that the chemical reaction that takes place is a redox reaction and identify the oxidizing and reducing species. (0.6 points) Answer one of the following questions: c1) Calculate the amount, in moles, of hydrogen peroxide that must be added to 2 liters of a hydrochloric acid solution at pH 1.0 so that, after the reaction is complete, it reaches a pH of 2.0. Assume that the volume of the solution does not change during the process. (1 point) c2) Justify whether the chemical reaction in part a) takes place spontaneously under standard conditions and deduce whether an analogous reaction takes place when hydrochloric acid is replaced by hydrofluoric acid, HF(aq). (1 point) Data: standard reduction potential, Eº (V): Cl₂(g)|Cl⁻(aq) = 1.36; H₂O₂(aq)|H₂O(l) = 1.76; F₂(g)|F⁻(aq) = 3.05.