{"knowledge_schema": {"broad_category": "Chemistry \u2192 Thermodynamics \u2192 Enthalpy Changes", "refinement": "This problem involves calculating the enthalpy change associated with a chemical reaction between acids and a base, considering their concentrations and volumes.", "specific_scope": "The focus is on the neutralization reaction between hydrochloric acid (HCl), sulfuric acid (H2SO4), and barium hydroxide (Ba(OH)2), and how to calculate the resulting enthalpy change from the reaction.", "goal": "Calculate the total enthalpy change when the specified volumes and concentrations of the acids and base are mixed."}, "summary": "This problem is centered on the concept of enthalpy changes in chemical reactions, specifically the neutralization of acids with a base. It requires calculating the total moles of reactants based on their concentrations and volumes, and then determining the enthalpy change associated with the reaction. The goal is to find the enthalpy change when combining 500 mL of 0.2 M HCl, 300 mL of 0.3 M H2SO4, and 200 mL of 0.5 M Ba(OH)2, which results in an enthalpy change of -2.72 kcal."}