{"knowledge_schema": {"broad_category": "Chemistry \u2192 Solutions \u2192 Precipitation Reactions", "refinement": "This problem involves stoichiometry and the calculation of volumes and concentrations in chemical reactions, specifically focusing on the precipitation of iron hydroxide from iron(III) chloride using sodium hydroxide.", "specific_scope": "The task is to determine the volume of sodium hydroxide solution needed to completely react with a given volume and concentration of iron(III) chloride solution to form iron(III) hydroxide precipitate, and to calculate the resulting pH of the solution after the reaction.", "goal": "Calculate the minimum volume of 0.2 M NaOH required for complete precipitation of Fe(OH)3 and determine the pH of the resulting solution."}, "summary": "This problem is centered around a precipitation reaction in chemistry, where we need to calculate the volume of sodium hydroxide required to completely precipitate iron(III) hydroxide from iron(III) chloride. It involves stoichiometric calculations based on the concentrations and volumes of the reactants. After determining the necessary volume of NaOH, we also need to find the pH of the resulting solution, which indicates the acidity or basicity after the reaction. The answer indicates that 37.5 cm\u00b3 of NaOH is required, resulting in a pH of 13.0."}