2021-2022 英语周报 高考外研 8答案

22.(15分)(1)除去油脂、溶解铝及其氧化物(2分)LAl(OH)4]+H=A(OH)3↓+H2O[或A1O2+H++H2 O-Al(OH)3+J(2 25(2)O2(或空气)(2分,其他合理答案也给分)取少量转化后的溶液于试管中,滴加K3[Fe(CN)6]溶液,溶液中没有蓝色沉淀产生,说明被转化的离子已经反应完全(2分)(3)0.01×(102-14)2[或105×(10814)2](2分)3.2≤pH<6.2(2分)(4)2N:2++CI0+40H--2NiO(OH)Y+Cl+H2O(2分)(5)提高镍的回收率(1分)【解析】(1)催化剂表面含有油脂,催化剂成分中含有铝及其氧化物,故“碱浸”中NaOH溶液的两个作用分别是除去油脂和溶解铝及其氧化物;“滤液①”中含有Na[Al(OH)4],将“滤液①”调为中性,生成Al(OH)3沉淀。(2)“转化”中H2O2作氧化剂,可用氧气或空气替代;“转化”步骤中,溶液中被转化的离子为Fe2+,取少量转化后的溶液于试管中,滴加K3[Fe(CN)6溶液,溶液中没有蓝色沉淀产生,说明Fe2+已经反应完全。(3)c(N2+)=0.01mol·L-1,pH=7.2时开始沉淀,则K[N(OH)2]=c(N2+)×c2(OH-)=0.01×(102-14)2;pH=8.7时,c(N2+)=1×10-5mol·L-,则K[Ni(OH)2]=c(N2+)×c2(OH)=10-5×(10-14)2。若“转化”后溶液中N·浓度为1.0mol·L,为避免N产生沉淀,则“调pH"时溶液中(OH)<103,即pH<6.2同时溶液中的Pe应沉淀完全,故“调pH"时应控制的pH范围为3.2≤pH<6.2。(4)由题意知,该反应的离子方程式为2N2++ClO+40H((OH)++CI"+H,O.(5)将分离出硫酸镍晶体后的母液收集、循环使用可提高镍的回收率。

One possible versionSeveral minutes later, the ice broke suddenly and Harry's feet sank into the water. It was noep, but his legs got wet to the knees. Harry was so upset that the accident would delay hisschedule. He had to find some firewood to build a fire to dry his clothes. He pulled off his glovestook out his matches, and lighted the fire. Seeing the burning fire, he had thought he was safe. Butsuddenly, without warming, a heavy mass of snow dropped down. The flame of hope was put outUnluckily, his dog ran away and the fear of death came over Harry. He had no choice but torun to save himself. However, he did not feel his feet when they hit the ground. Having falleneveral times, he decided to rest a while. As he lay in the snow, he noticed he was not shaking. Hecould not feel his nose or fingers or feet. A feeling of horror came into his mind. It was when herealized he was going to die that he heard a bark and the noise his friends made

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