{"knowledge_schema": {"broad_category": "Chemistry \u2192 Coordination Chemistry \u2192 Complex Ion Equilibria", "refinement": "This problem involves calculating the concentration of free magnesium ions in a solution containing a metal-ligand complex, specifically the Mg-EDTA complex.", "specific_scope": "The focus is on determining the concentration of magnesium ions in a solution at a specific pH and temperature, given the stability constant of the complex.", "goal": "Calculate the concentration of free magnesium ions (Mg\u00b2\u207a) in the solution using the provided stability constant and the concentration of the Mg-EDTA complex."}, "summary": "This problem is rooted in coordination chemistry, specifically dealing with the equilibrium of metal-ligand complexes. It requires calculating the concentration of free magnesium ions in a solution containing a stoichiometric Mg-EDTA complex at a given pH and temperature. The stability constant (K_Mg-EDTA) is used to relate the concentration of the complex to the concentration of free magnesium ions. The goal is to find the concentration of Mg\u00b2\u207a ions based on the provided information."}