Watch the stroke order, then trace it yourself.


caustic soda
alkalinization; to alkalize
alkaline property
alkaline water; lye water
soda ash; sodium carbonate
acid and alkali
When making noodles, a little lye water is sometimes added.
In chemistry class, the teacher explained the properties of alkalis.
In industry, caustic soda is a very important basic chemical raw material.
Caustic soda is commonly used in industry to produce soap and paper.
Alkali and acid react with each other.
The alkalinity of this soil is too strong; it's not suitable for growing this plant.
This soil is too alkaline and is not suitable for growing flowers.
This cleaner contains a strong alkali, so gloves are needed when using it.
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Characters pronounced "jian".
Characters with radical "石".