Why is phosphoric acid used in some Coca‑Cola drinks?

To add to their taste.

We use a very small amount of phosphoric acid in some of our soft drinks, such as Coca‑Cola, Diet Coke, Coke Zero and Thums Up to help give them their bite. It is a safe food additive approved by all of the national health authorities in the more than 200 countries in which we operate, including FSSAI (Food Safety and Standards Authority of India). Phosphoric acid is a very common additive used in cola-flavoured beverages in India and worldwide

Did you know? Phosphoric acid contains a small amount of the mineral phosphorus. Phosphorus is found widely in nature and helps give our bodies energy. It is also a big component of bones and teeth.