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稀释一定温度下饱和FeCl_3溶液是配备指定浓度FeCl_3溶液的好方法。Fe~(3+)的检验中刻意用指定浓度0.1mol·L~(-1)的FeCl_3溶液是不必要的。
Dilution of a certain temperature saturated FeCl_3 solution is equipped with a specified concentration of FeCl_3 a good solution. It is not necessary to deliberately use the FeCl 3 solution with the concentration of 0.1 mol·L -1 in Fe 3+ test.