一、有关物质的量与阿伏加德罗常数的计算例1(江苏化学卷)设NA为阿伏加德罗常数的值.下列说法正确的是().A.1L1mol·L-1的NaClO溶液中含有ClO-的数目为NA B.78g苯含有C=C双键的数目为3 NA C.常温常压下,14g由N2与CO组成的混合气体...一、有关物质的量与阿伏加德罗常数的计算例1(江苏化学卷)设NA为阿伏加德罗常数的值.下列说法正确的是().A.1L1mol·L-1的NaClO溶液中含有ClO-的数目为NA B.78g苯含有C=C双键的数目为3 NA C.常温常压下,14g由N2与CO组成的混合气体含有的原子数目为NA D.标准状况下,6.展开更多
The separation and recovery of Ni from the copper electrolyte by crystallization of nickel ammonium sulfate double salt were studied.It is found that the solubility of copper sulfate at the same temperature is less th...The separation and recovery of Ni from the copper electrolyte by crystallization of nickel ammonium sulfate double salt were studied.It is found that the solubility of copper sulfate at the same temperature is less than that of nickel sulfate,while the solubility of copper ammonium sulfate is greater than that of nickel ammonium sulfate.So,by adding(NH_(4))_(2)SO_(4),the Ni can be selectively crystallized from the copper electrolyte.By adding(NH_(4))_(2)SO_(4)at the molar ratio of(NH_(4))_(2)SO_(4)/NiSO_(4)≤0.8,and crystallizing at−15℃for 10 h,the Ni in the copper electrolyte can be crystallized in the form of Ni(NH_(4))_(2)(SO_(4))_(2)×6H_(2)O.The qualified product of NiSO_(4)×6H_(2)O can be obtained by pyrolyzing the crystals,dissolving the pyrolysis product in water,and then concentrating the dissolved solution for crystallization.The method of double salt crystallization is a clean,environmentally-friendly,cost-effective and efficient method for separating and recovering nickel from copper electrolyte.展开更多
文摘一、有关物质的量与阿伏加德罗常数的计算例1(江苏化学卷)设NA为阿伏加德罗常数的值.下列说法正确的是().A.1L1mol·L-1的NaClO溶液中含有ClO-的数目为NA B.78g苯含有C=C双键的数目为3 NA C.常温常压下,14g由N2与CO组成的混合气体含有的原子数目为NA D.标准状况下,6.
基金the National Natural Science Foundation of China(No.50274075).
文摘The separation and recovery of Ni from the copper electrolyte by crystallization of nickel ammonium sulfate double salt were studied.It is found that the solubility of copper sulfate at the same temperature is less than that of nickel sulfate,while the solubility of copper ammonium sulfate is greater than that of nickel ammonium sulfate.So,by adding(NH_(4))_(2)SO_(4),the Ni can be selectively crystallized from the copper electrolyte.By adding(NH_(4))_(2)SO_(4)at the molar ratio of(NH_(4))_(2)SO_(4)/NiSO_(4)≤0.8,and crystallizing at−15℃for 10 h,the Ni in the copper electrolyte can be crystallized in the form of Ni(NH_(4))_(2)(SO_(4))_(2)×6H_(2)O.The qualified product of NiSO_(4)×6H_(2)O can be obtained by pyrolyzing the crystals,dissolving the pyrolysis product in water,and then concentrating the dissolved solution for crystallization.The method of double salt crystallization is a clean,environmentally-friendly,cost-effective and efficient method for separating and recovering nickel from copper electrolyte.
