Sodium Citrate, Density : 1.7 g/cm³

Sodium Citrate also known tri sodium citrate or sodium salt of Citric acid. 

It possesses a saline, mildly tart flavor, and is a mild alkali.

Sodium citrate is chiefly used as a food additive, usually for flavor or as a preservative. Its E number is E331. Sodium citrate is employed as a flavoring agent in certain varieties of club soda. It is common as an ingredient in bratwurst, and is also used in commercial ready-to-drink beverages and drink mixes, contributing a tart flavor. It is found in gelatin mix, ice cream, yogurt, jams, sweets, milk powder, processed cheeses, carbonated beverages, [3] amongst others.