{"knowledge_schema": {"broad_category": "Chemistry \u2192 Acid-Base Reactions \u2192 pH Calculation", "refinement": "This problem involves the neutralization reactions between a weak base (NH3) and a strong acid (HNO3), as well as a strong base (KOH).", "specific_scope": "The focus is on calculating the final pH of the solution after mixing the specified volumes and concentrations of NH3, HNO3, and KOH.", "goal": "Determine the pH of the resulting solution after the reactions between the acids and bases have occurred."}, "summary": "This problem is centered around acid-base chemistry, specifically the calculation of pH after mixing solutions of a weak base (ammonia), a strong acid (nitric acid), and a strong base (potassium hydroxide). The task involves determining the final concentrations of the species present after the neutralization reactions and calculating the resulting pH. The answer to the problem is 12.48, indicating a basic solution after the reactions."}