Question: What is the chemical formula of the kind of ash of which Middlewich Folk and Boat Festival celebrates the raw materials needed for the manufacturing?
Sentence (from "Sodium carbonate"): Sodium carbonate (also known as washing soda, soda ash and soda crystals, and in the monohydrate form as crystal carbonate), NaCO, is the water-soluble sodium salt of carbonic acid.
Relevant evidence: Yes