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washing soda

noun
🔊/ˈwɒʃɪŋ səʊdə/
🔊/ˈwɑːʃɪŋ səʊdə/
(also sodium carbonate)
[uncountable]
(symbol Na2CO3)
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  1. a chemical in the form of white crystals or powder that dissolves (= turns to liquid when mixed with another liquid) and is used in making glass, soap and paper, and for making water soft碳酸钠