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16 Nov 2019
Substances A^2+, B^2+ all in the same chemical family, and all form nitrate salts. In water solution, the nitrate salts of these captions are colorless and very soluble. However, when added to different anions in solution, precipitates sometimes form. following pattern is observed: Key: S = Solid (precipitate) forms; aq = Soluble (no precipitate forms). Also indicate precipitate color, degree of cloudiness and any other characteristics you may observe. a. Order these cations (A^2+, B^2+ and C^2+) in terms of their solubility. most soluble Bar B^2+ A^2+ C^2+ least soluble b. If you assume that the most soluble cation has the smallest atomic number, order these elements as they would appear in their family on the periodic table. largest smallest You are given an unknown that may contain only one cation A^2+, B^2+ or C^2+ each of whose properties are given in Problem 1 above. You have available to you solutions of Na_2SO_4, Na_2CO_3, and (NH_4)_2C_2O_4. Using only two of these solutions, develop a simple procedure for identifying the cation that is present in your unknown. Use the space below for your procedure.
Substances A^2+, B^2+ all in the same chemical family, and all form nitrate salts. In water solution, the nitrate salts of these captions are colorless and very soluble. However, when added to different anions in solution, precipitates sometimes form. following pattern is observed: Key: S = Solid (precipitate) forms; aq = Soluble (no precipitate forms). Also indicate precipitate color, degree of cloudiness and any other characteristics you may observe. a. Order these cations (A^2+, B^2+ and C^2+) in terms of their solubility. most soluble Bar B^2+ A^2+ C^2+ least soluble b. If you assume that the most soluble cation has the smallest atomic number, order these elements as they would appear in their family on the periodic table. largest smallest You are given an unknown that may contain only one cation A^2+, B^2+ or C^2+ each of whose properties are given in Problem 1 above. You have available to you solutions of Na_2SO_4, Na_2CO_3, and (NH_4)_2C_2O_4. Using only two of these solutions, develop a simple procedure for identifying the cation that is present in your unknown. Use the space below for your procedure.
Jean KeelingLv2
25 Aug 2019