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?

full_context: Document 1: Sodium bisulfate: Sodium bisulfate, also known as sodium hydrogen sulfate, is the sodium salt of the bisulfate anion, with the molecular formula NaHSO. Sodium bisulfate is an acid salt formed by partial neutralization of sulfuric acid by an equivalent of sodium base, typically either in the form of sodium hydroxide or sodium chloride. It is a dry granular product that can be safely shipped and stored. The anhydrous form is hygroscopic. Solutions of sodium bisulfate are acidic, with a 1M solution having a pH of around 1.
Document 2: 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.
Document 3: Bridgewater Canal: The Bridgewater Canal connects Runcorn, Manchester and Leigh, in North West England. It was commissioned by Francis Egerton, 3rd Duke of Bridgewater, to transport coal from his mines in Worsley to Manchester. It was opened in 1761 from Worsley to Manchester, and later extended from Manchester to Runcorn, and then from Worsley to Leigh.
Document 4: Carbonated water: Carbonated water (also known as club soda, soda water, sparkling water, seltzer water, bubbly water, or fizzy water) is water into which carbon dioxide gas under pressure has been dissolved. Some of these have additives, such as sodium chloride, sodium bicarbonate or similar, but seltzer water is almost always composed of water and carbon dioxide with no other additives. This process, known as carbonation, is a process that causes the water to become effervescent. Most carbonated water is sold in ready to drink bottles as carbonated beverages such as soft drinks. However, it can also be prepared at home with soda makers.
Document 5: The Lichfield Festival: The Lichfield Festival is an annual multi-art-form festival held in Lichfield, Staffordshire, England, which aims to combine high quality, challenging and diverse events of an international calibre, alongside community-based, locally sourced activities. Performances include drama, dance, film, literature, visual arts, jazz, folk, classical and world music. Performances take place principally in the medieval Lichfield Cathedral and the 21st century Lichfield Garrick theatre, alongside non-traditional venues across the County. The Festival also incorporates free community events such as the Festival Market and the Festival Fireworks.
Document 6: Droitwich Canal: The Droitwich Canal is a synthesis of two canals in Worcestershire, England; the Droitwich Barge Canal and the Droitwich Junction Canal. The Barge Canal is a broad canal which opened in 1771 linking Droitwich Spa to the River Severn at Hawford Mill, Claines. The Droitwich Junction Canal is a narrow canal, opened in 1854, which linked Droitwich to the Worcester and Birmingham Canal. Both were built to carry salt, and were abandoned in 1939. They have been the subject of a restoration plan since 1973, and the Barge Canal was officially reopened in 2010, while the Junction Canal reopened in July 2011. Following the opening of the canal, ownership transferred to the newly created Canal and River Trust
Document 7: Sodium polycarboxylate: Sodium polycarboxylate is the name used on consumer product labels in the United States to designate a family of anionic polymers with a long carbon chain backbone along which are many attached carboxyl functional groups. They are used in consumer household cleaning products to enhance performance, and prevent redeposition of the material removed from the dirty article. In the United States the major end-use is in powdered home laundry detergents. The commonly used molecular weights range from 2,000-10,000. They can be homopolymers, made from one type of monomer, such as 2-propanoic acid, or heteropolymers (copolymers), made from two monomers, such as acrylate and maleic acid. These copolymers can be made in any ratio, thus the designation "sodium polycarboxylate" covers a wide range of distinct molecules.
Document 8: The Middlewich Paddies: The Middlewich Paddies are an Irish folk band formed in 1979 in the town of Middlewich in Cheshire. Although not widely known outside of folk music circles, two members of the band were instrumental in setting up the Middlewich folk and boat festival which has now become a recognised festival on the folk circuit.
Document 9: Middlewich Folk and Boat Festival: 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.
Document 10: Anderton Boat Lift: The Anderton Boat Lift is a two caisson lift lock near the village of Anderton, Cheshire, in North West England. It provides a 50 ft vertical link between two navigable waterways: the River Weaver and the Trent and Mersey Canal. The structure is designated as a scheduled monument, and is included in the National Heritage List for England.
Document 11: Sodium bisulfite: Sodium bisulfite (or sodium bisulphite) (sodium hydrogen sulfite) is a chemical compound with the chemical formula NaHSO. Sodium bisulfite is a food additive with E number E222. This salt of bisulfite can be prepared by bubbling sulfur dioxide in a solution of sodium carbonate in water. Sodium bisulfite in contact with chlorine bleach (aqueous solution of sodium hypochlorite) will generate heat and form sodium bisulfate and sodium chloride.
Document 12: Sankey Canal: The Sankey Canal, which is also known as the Sankey Brook Navigation and the St Helens Canal, historically entirely within Lancashire is a canal now in Cheshire, extending into Merseyside, in the northwest of England, connecting St Helens with the River Mersey at Spike Island. When opened in 1757, it ran along the valley of the Sankey Brook from the point where the brook joined the Mersey, past Warrington to Parr at the north east of what became St Helens town centre. Extensions were constructed at the Mersey end of the canal, firstly to Fiddlers Ferry and then to Widnes, while at the northern end, it was extended into Sutton, close to what became the centre of St Helens. The canal was gradually abandoned between 1931 and 1963, but has been the object of a restoration attempt since 1985, when the Sankey Canal Restoration Society was formed.
Document 13: Sodium chloride: Sodium chloride , also known as salt or halite, is an ionic compound with the chemical formula NaCl, representing a 1:1 ratio of sodium and chloride ions. With molar masses of 22.99 and 35.45 g·mol, respectively, 100 g of NaCl contain 39.34 g Na and 60.66 g Cl. Sodium chloride is the salt most responsible for the salinity of seawater and of the extracellular fluid of many multicellular organisms. In the form of edible or table salt it is commonly used as a condiment and food preservative. Large quantities of sodium chloride are used in many industrial processes, and it is a major source of sodium and chlorine compounds used as feedstocks for further chemical syntheses. A second major application of sodium chloride is de-icing of roadways in sub-freezing weather.
Document 14: Ballyclare: It sits on the river Six Mile Water. The town probably owes its origins to its being a crossing point of the river, the strategic importance of which is shown by existence of a small Norman motte on the south side of the river and presently located in the War Memorial Park. The broad main street dates from the 17th century. In the centre of the town is the Market Square with the Town Hall. The town grew in the 19th century with the coming of the railway and it became an important industrial town with a large paper mill in the South West of the town and a large Linen Bleach Green . These factories gave their names to the roads leading to them, the Mill Road and the Green Road, but have been closed for some time. It is now a local service centre with a significant dormitory role in relation to Belfast. It is the main focus within the rural area for shopping, education and recreation. To the north is the remnant of Craig Hill, which once provided a wooded backdrop but is now covered with modern housing. Much of the Craig Hill has been quarried for its basalt.
Document 15: Sodium selenate: Sodium selenate is the inorganic compound with the formula Na2SeO4 , not to be confused with sodium selenite. It exists as the anhydrous salt, the heptahydrate, and the decahydrate. These are white, water-soluble solids. The decahydrate is a common ingredient in multivitamins and livestock feed as a source of selenium. The anhydrous salt is used in the production of some glass. Although the selenates are much more toxic, many physical properties of sodium selenate and sodium sulfate are similar.
ground_truth: NaCO