复盐是指含有两种或以上阴离子或阳离子,但有固定组成的晶型的简单类,属于化合物。复盐与络盐不同,复盐溶于水会离解出所有的简单离子,而络盐中的配离子会保持不变。复盐也不是两种盐类的混合物,复盐有单独的结晶,且其比例固定,这都是纯物质的特征。通常而言,复盐的特性由其组成的简单盐类并不相同。复盐通常可由混合这两种盐饱和溶液并结晶而制得。

常见的复盐有:

参见

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