Qualitative Analysis for Metallic Elements (Section)(a) Precipitation of the group 4 catio...

Qualitative Analysis for Metallic Elements (Section)

(a) Precipitation of the group 4 cations of Figure requires a basic medium. Why is this so?

Figure The characteristic yellow light in a sodium lamp results from excited electrons in the high-energy 3p orbital falling back to the lower-energy 3s orbital.

(b) What is the most significant difference between the sulfides precipitated in group 2 and those precipitated in group 3? (c) Suggest a procedure that would serve to redissolve the group 3 cations following their precipitation.