Which acid is commonly found in the sauces served at Panda Express?

The correct choice is acetic acid, which is commonly known as the main component of vinegar. At Panda Express, acetic acid is often used in sauces to enhance flavor, particularly in varieties like sweet and sour sauce and some salad dressings. Its acidic nature adds a tangy taste that balances the sweetness and richness of other ingredients, creating a harmonious flavor profile that is enjoyable for customers.

In terms of usage in food, acetic acid not only contributes to taste but also acts as a preservative, helping to increase the shelf life of sauces by inhibiting the growth of certain bacteria. This quality makes it a practical choice for restaurant environments where sauces are prepared in bulk and need to stay fresh for extended periods.

Other acids mentioned, like citric acid, lactic acid, and phosphoric acid, are also used in various culinary applications but are not as representative of the sauces typically served at Panda Express. Citric acid is often associated with citrus flavors, while lactic acid is more common in fermented products, and phosphoric acid is found in some soft drinks. Hence, acetic acid stands out as the most relevant choice in this context.