16.参考答案(1)延长浸取时间或充分搅拌或适当增加硫酸的量或适当加热(2分)SO和PbSO4(2分)(2MnO4+5Fe2+8H=M2++5Fe3++4H2O(2分)(3)Sn4(1分)KSCN溶液(1分)(4)3ZnSO4 +2Na2 HPO4Zn3(PO4 )2+Na2 SO4 +2NaHSO4 DX 3ZnSO4Na2HPO4=Zn3(PO4)2↓+2Na2SO4+H2SO4(2分)(5)85.7%(2分说明分析(1)“酸溶”时,适当增大液固比(增加硫酸的量)、充分搅拌、延长浸取时间及适当加热等均可提高浸出率。烧铸灰加人25%的硫酸后,SiO2与硫酸不反应PbO与硫酸反应生成PbSO2沉淀,所以酸溶后过滤得到的“滤渣1”的主要成分为SO2和PbSO4。2)KMnO4与F2+发生反应生成Mn2和Fe3,离子方程式为MnO+5Fe2++8H+Mn21+5Fe3++4H2O(3)由表中数据可知pH为40时,Sn1、Fe3均沉淀完全;要检验过滤之后的溶液中是否含有Fe3+,可取样滴人KSCN溶液观察溶液是否变红。(4)由题中信息可知溶液中的阴离子主要是硫酸根离子,“制备”时,加入Na2HPO2与Zn2+反应生成磷锌白[Zn3(PO2)2,根据元素守恒,反应的化学方程式为3ZnSO4+2 Na2 HPC4-Zn3(PO4)2+Na2SO)4+2 NaSO4或3ZnSO4+2Na2 HPO4=Ln3(PO4)2 Y+2Na2 SO 4+H2 SO4(5)7t烧铸灰(ZnO的质量分数为81%)含锌质量m1(Zn)=7t×81%×(×100%)t,产品7.7tZn3(PO4)2含锌质量m2(Zn)=7.7t(5×3+385100%)=391,则产率=45+×100≈87%
第一节短文改错(共10小题;每小题1分,满分10分)I believe that eyeing is my favourites sport for severalfavouritereasons. First of all, it is a fast and healthy way to get fromone place to others. In the meantime, when ride a bike,anotherI don't pollute the environment. Instead of it is often calledgreen travel". Then cycling is a great way to keep myenergy and state of minds just like any other sport, thacan help lift my spirit. More important, what is significantfor me is the sense of freedom when comparing to other formsof movement. In conclusion, cycling gives me a chance AIt.
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