Hydrogen sulfite, represented by the chemical formula HSO3-, is an anion that consists of one hydrogen atom bonded to a sulfite ion. The sulfite ion, SO3^2-, has a negative charge of 2, and when it combines with a hydrogen ion (H+), it forms the hydrogen sulfite anion. This anion is commonly found in various chemical reactions and compounds, such as in acidic solutions and as a component of certain salts. The correct answer, HSO3-, accurately represents the chemical formula for hydrogen sulfite.