Sodium carbonate-13C is primarily used as a labeled compound in research and analytical applications. It serves as a tracer in studies involving carbon pathways, particularly in environmental and biochemical research. Its isotopic labeling allows scientists to track and analyze carbon movement in chemical reactions, metabolic processes, and carbon cycle studies. Additionally, it is utilized in nuclear magnetic resonance (NMR) spectroscopy as a reference standard to ensure accurate measurements and interpretations of carbon-containing compounds. This compound is also employed in the development of advanced materials and in pharmaceutical research to study drug metabolism and degradation pathways.