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[主观题]
取Al3+和Zn2+混合液25.00ml,调节溶液pH≈3,加入0.05000mo/LEDTA溶液30.00ml,煮沸。
再调节pH为5~6,以PAN为指示剂,以0.05000mol/LCu2+标准溶液返滴定,消耗Cu2+溶液6.00ml。另取上述试液25.00ml,加NH4F掩蔽Al3+,调节pH为10,以铬黑T为指示剂,用上述EDTA溶液滴定,消耗EDTA溶液22.00ml。计算溶液中Al3+和Zn2+的含量(g/L)。(MAl=26.98,MZn=65.38)
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