The chlorinated acetic acid MCA (monochloroacetic acid) has the formula ClCH2COOH. It is a colorless or white crystalline solid that dissolves in water and polar solvents and has a strong odor. MCA is a versatile chemical that has a wide range of applications. It is primarily used to produce carboxymethyl cellulose (CMC), a water-soluble polymer used as a thickener, stabilizer, and emulsifier in a wide range of industries including food, pharmaceuticals, and personal care.