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硫酸盐有形成复盐之趋势。由三价金属硫酸盐与除锂以外的碱金属、NH_4~+、Tl~+的硫酸盐所形成的同晶型的化合物,这类化合物称为矾。
Sulfate has a tendency to form double salts. An isomorphous compound formed by a trivalent metal sulfate and an alkali metal other than lithium, NH 4 +, T 1 +, and such a compound is referred to as anthraquinone.