A- a water soluble salt forms a precipitant during Group 3 analysis. An acidic solution of this precipitant and NaBiO3 yields a pinkish color. This same salt has no reaction to concentrated H2SO4 or AgNO3, what is the chemical formula for this salt?
B- a brown colored salt contains a cation from group 3, it has no reaction with concentrated H2SO4 and produces a soluble product with acidic AgNO3 and acidic BaCl2, this salt is not water soluble. What is the chemical formula for this salt?
A.
Mn is in group III and it is oxidized to pink MnO4^- with NaBiO3. The anion probably is sulfate but a confirmatory test would be necessary to be certain; therefore, the salt probably is MnSO4.
To determine the chemical formulas for the two salts described, we need to analyze the given information about their reactions with different reagents.
A - For the first salt, it reacts with an acidic solution of NaBiO3 to produce a pinkish color precipitant. It does not react with concentrated H2SO4 or AgNO3.
To identify the salt, we can use the process of elimination. First, the fact that it forms a precipitant during Group 3 analysis suggests that it contains a Group 3 cation. The pinkish color indicates the formation of a bismuth compound during the reaction with NaBiO3.
Considering that it does not react with concentrated H2SO4 (which can react with most Group 3 salts) or AgNO3 (which can form a precipitate with many anions), we can conclude that the anion in the salt must be sulfate (SO4^2-). Therefore, the chemical formula for this salt is Bi2(SO4)3.
B - For the second salt, it is brown in color and does not react with concentrated H2SO4. It produces a soluble product with both acidic AgNO3 and acidic BaCl2. Additionally, it is not water soluble.
Based on this information, we can infer that the cation in the salt is from Group 3 since it does not react with concentrated H2SO4, which would indicate the presence of any other Group. The fact that it forms a soluble product with acidic AgNO3 suggests that the anion is chloride (Cl^-).
Considering that it also produces a soluble product with acidic BaCl2, we can conclude that the anions in the salt are chlorides. Since the salt is not water soluble, it must contain more than one chloride ion. Therefore, the chemical formula for this salt is MCl2, where M represents the Group 3 cation.