Duda's Sodium Carbonate Dense Soda Ash by Duda Energy Chemical Formula: Na2CO3 Grade: Industrial / Technical Grade Specification: 99.8% Soda Ash / 0.2% Water Form: Dense granular. This chemical is widely used as a water softener. It can also be used to make glass and to regulate pH levels. It is also a good base to neautralize and clean up acid spills. How is it made? Limestone and salt is mined from the ground. The sodium carbonate is then derived from this limestone and salt.