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?
Related documents: [0]  [DOC] The Middlewich Folk and Boat Festival takes place in June in Middlewich, Cheshire, England. The festival builds on the town's industrial heritage in which canal boats were used to move coal and other raw materials in the town for the production of salt, and then move the salt out of town, either for use directly, or as a raw material in the manufacture of chemicals such as chlorine and soda ash. [END] 
[1]  [DOC] 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. [END] 
Answer: 
NaCO
NaCO