Citric acid is an organic acid and one of the main components in lemon. It is also widely used in food and beverage as acidulant, preservative and antioxidant. Sodium citrate is a salt of citric acid and sodium, which is colorless crystal or white powder. It is also widely used in food and medicine as sour agent, buffer and starter.
Citric acid and sodium citrate have different chemical properties and cannot simply replace each other. If you need to use sodium citrate in recipes or recipes, and you only have citric acid on hand, it is recommended that you do not change it at will, so as not to affect the quality and taste of food or products.