喺化學,根據最常見定義,鹽(英文:Salt)係可以由酸加鹼中和而成嘅離子化合物。所有鹽都屬於離子化合物,但係唔係所有離子化合物都係鹽。鹽常見嘅例子有氯化鈉,而唔係鹽嘅例子有氫氧化鈉。
根據IUPAC,鹽同離子化合物係同一樣嘢。
鹽分類法有多種,例如鹽分為工業用鹽同食鹽;又或者分為生物鹽同化學鹽;有機鹽同無機鹽咁。
鈉、鉀、銨鹽一般易溶喺水,通常硝酸鹽同碳酸氫鹽都易溶。如果係鹵化物嘅話,咁樣銀、鉛唔溶。如果係硫酸鹽嘅話,咁鋇、鉛唔溶,而硫酸鈣少少溶。除咗以上易溶嘅陽離子之外,一般嘅碳酸鹽都唔溶。
其實鹽有咩顔色係取決於渠入面嘅離子。例如:
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