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Washing Soda: Soda Ash Crystallised from Hot Water
Washing soda is sodium carbonate crystallised with ten parts of water. George Fownes's chemistry manual (1856) makes it from soda ash: dissolve it in hot water, filter, and let it cool slowly; large clear crystals form. They turn to white powder in dry air, so keep them closed.
The picture: sodium carbonate crystals grown on a slide, seen through crossed polarisers.
初学者
A day with cooling
说明
1
1
Dissolve the soda ash
Dissolve the soda ash
Stir soda ash into hot water until no more dissolves. Fownes: the crystals dissolve in less than their own weight of boiling water.
此步骤所需材料：
碳酸钠（纯碱）500 克
水1 升所需工具：
等臂天平
玻璃烧杯
电热板
化学防溅护目镜
橡胶手套2
2
Filter it hot
Filter it hot
Filter the hot solution to take out the insoluble dirt of the soda ash.
所需工具：
滤纸
带颈玻璃漏斗玻璃烧杯化学防溅护目镜橡胶手套3
3
Cool slowly
Cool slowly
Pour it into a wide dish, cover it loosely and leave it to cool slowly. Large clear crystals grow.
所需工具：
蒸发皿4
4
Drain and store closed
Drain and store closed
Pour off the liquor and drain the crystals. Store them in a closed jar: in dry air they lose water and crumble to white powder.
所需工具：
玻璃罐化学防溅护目镜橡胶手套5
5
Soda ash to crystals
Soda ash to crystals
正在加载 Jupyter 笔记本…
6
6
Limits
Limits
The method is Fownes's; the quantities are ours. Washing soda is alkaline and irritates eyes and skin.
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