Electrophilic aromatic substitution reactions are common in the organic chemistry laboratory. These reactions, while ubiquitous, use corrosive reagents and halogenated or hydrophobic solvents that produce expensive and hazardous waste streams. The carboxylation of phenols (Kolbe-Schmitt reaction), although aqueous, typically involves conditions (high pressure/temperature) that are not well-suited fora large teaching laboratory. The following experiment modifies the Kolbe-Schmitt process for ambient pressures and aqueous reflux temperatures. This procedure is safe, simple, and inexpensive and uses [superscript 13]C NMR as an analytical tool to confirm product synthesis and investigate changes in molecular symmetry.