An analytical methodology is proposed based on constant ratio and absorbance correction methods to quantify sodium carbonate, Na<sub>2</sub>CO<sub>3</sub> (1450 cm<sup>?1</sup>), and sodium bicarbonate, NaHCO<sub>3</sub> (1000 cm<sup>?1</sup>, 1923 cm<sup>?1</sup>), in solid mixtures using Fourier transform infrared (FT-IR) spectroscopy. Potassium ferricyanide, K<sub>3</sub>Fe(CN)<sub>6</sub> (2117cm<sup>?1</sup>), was used as an internal standard to get characteristic parameters. NaHCO<sub>3</sub> was quantified using the constant ratio method. Spectral interference of NaHCO<sub>3</sub> in Na<sub>2</sub>CO<sub>3</sub> (1450 cm<sup>?1</sup>) was corrected using the absorbance correction method. The corrected absorbance was successfully applied to quantify Na<sub>2</sub>CO<sub>3</sub> (1450 cm<sup>?1</sup>) in the mixture using the constant ratio method. The results obtained for simulated samples were satisfactory (relative standard deviation less than 7%) for all samples.

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