Final answer:
The formula for the conjugate acid of the Brønsted-Lowry base carbonate ion (CO3²⁻) is bicarbonate (HCO3⁻).
Step-by-step explanation:
The student is asking to write the formula for the conjugate acid of the Brønsted-Lowry base CO3²⁻. A Brønsted-Lowry base is a substance that can accept a proton (H+), and its conjugate acid is what the base becomes after it accepts the proton. In this case, the carbonate ion (CO3²⁻) would accept a proton to form bicarbonate (HCO3⁻). So, the formula for the conjugate acid of CO3²⁻ is HCO3⁻.