{"knowledge_schema": {"broad_category": "Chemistry \u2192 Solutions \u2192 Concentration Calculations", "refinement": "This problem involves calculating the concentration of specific ions in a solution based on the amounts of solutes and their molecular weights.", "specific_scope": "The focus is on determining the concentration of orthophosphate ions (PO4^3-) in a solution containing potassium dihydrogen phosphate (KH2PO4) and disodium hydrogen phosphate dihydrate (Na2HPO4\u00b72H2O).", "goal": "Calculate the concentration of orthophosphate ions in molarity (M) from the given mass of solutes and their dissociation in solution."}, "summary": "This problem is centered around chemistry, specifically the calculation of ion concentration in a solution. It involves determining the concentration of orthophosphate ions from the given amounts of KH2PO4 and Na2HPO4\u00b72H2O, using their molecular weights and the dissociation of these compounds in solution. The goal is to find the molarity of orthophosphate ions, which is calculated to be 6.24x10^-7 M, based on the provided data."}