Based on the results of the tests you've described, we can make the following deductions:

1. The production of a colorless gas when the salt is treated with concentrated nitric acid suggests the presence of a carbonate or bicarbonate anion (CO3^2- or HCO3^-). This is because carbonates and bicarbonates react with acids to produce carbon dioxide, which is a colorless gas.

2. The lack of a precipitate when the resulting solution is further treated with concentrated hydrochloric acid suggests that the cation is not one of those that form insoluble chlorides (like Ag+, Pb2+, or Hg2+).

3. The lack of a precipitate with 2,2'-bipyridine and the lack of a blood-red solution with thiocyanate (SCN-) suggest that the cation is not a transition metal, as many transition metals form colored complexes with these reagents.

4. The dark brick-red color in the flame test suggests the presence of a calcium cation (Ca2+). This is because calcium salts give a brick-red color in the flame test.

Based on these deductions, the salt is likely to be Calcium Carbonate (CaCO3). However, further tests would be needed to confirm this.

Question

Based on the results of the tests you've described, we can make the following deductions:

1. The production of a colorless gas when the salt is treated with concentrated nitric acid suggests the presence of a carbonate or bicarbonate anion (CO3^2- or HCO3^-). This is because carbonates and bicarbonates react with acids to produce carbon dioxide, which is a colorless gas.

2. The lack of a precipitate when the resulting solution is further treated with concentrated hydrochloric acid suggests that the cation is not one of those that form insoluble chlorides (like Ag+, Pb2+, or Hg2+).

3. The lack of a precipitate with 2,2'-bipyridine and the lack of a blood-red solution with thiocyanate (SCN-) suggest that the cation is not a transition metal, as many transition metals form colored complexes with these reagents.

4. The dark brick-red color in the flame test suggests the presence of a calcium cation (Ca2+). This is because calcium salts give a brick-red color in the flame test.

Based on these deductions, the salt is likely to be Calcium Carbonate (CaCO3). However, further tests would be needed to confirm this.

Knowee AI · Accepted Answer

Based on the results of the tests you've described, we can make the following deductions:

1. The production of a colorless gas when the salt is treated with concentrated nitric acid suggests the presence of a carbonate or bicarbonate anion (CO3^2- or HCO3^-). This is because carbonates and bicarbonates react with acids to produce carbon dioxide, which is a colorless gas.

2. The lack of a precipitate when the resulting solution is further treated with concentrated hydrochloric acid suggests that the cation is not one of those that form insoluble chlorides (like Ag+, Pb2+, or Hg2+).

3. The lack of a precipitate with 2,2'-bipyridine and the lack of a blood-red solution with thiocyanate (SCN-) suggest that the cation is not a transition metal, as many transition metals form colored complexes with these reagents.

4. The dark brick-red color in the flame test suggests the presence of a calcium cation (Ca2+). This is because calcium salts give a brick-red color in the flame test.

Based on these deductions, the salt is likely to be Calcium Carbonate (CaCO3). However, further tests would be needed to confirm this.

Question

使用实验说明研究盐中阳离子和阴离子的身份，并获得以下结果：

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