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Sodium Bicarbonate from Soda Ash and Carbon Dioxide
Sodium bicarbonate, sold as baking soda, is made from sodium carbonate (soda ash): Na₂CO₃ + CO₂ + H₂O → 2 NaHCO₃. Soda ash is dissolved in water and treated with carbon dioxide, and sodium bicarbonate comes out of the solution as a solid. In 1846 John Dwight and Austin Church opened the first factory in the United States to make baking soda this way. Dry the product gently: from 80–100 °C sodium bicarbonate slowly breaks down again into sodium carbonate, water and carbon dioxide.
中级
Factory process
说明
1
1
Dissolve the soda ash
Dissolve the soda ash
Dissolve sodium carbonate in water.
此步骤所需材料：
碳酸钠（纯碱）1 as required
水1 as required所需工具：
沉淀罐2
2
Treat with carbon dioxide
Treat with carbon dioxide
Pass carbon dioxide into the solution. Na₂CO₃ + CO₂ + H₂O → 2 NaHCO₃. Sodium bicarbonate precipitates as a solid.
此步骤所需材料：
二氧化碳气体1 as required3
3
Filter and dry
Filter and dry
Filter off the solid and dry it below 80 °C, where it starts to decompose back into sodium carbonate.
所需工具：
压滤机
低温干燥机
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