Application of the Solubility Product Principle to Qualitative Analysis

Application of the Solubility Product Principle to Qualitative Analysis [Pg.754]

In Section 4.6, we discussed the principle of gravimetric analysis, by which we measure the amount of an ion in an unknown sample. Here we will briefly discuss qualitative antdysis, the determination of the types of ions present in a solution. We will focus on the cations. [Pg.754]

There are some 20 common cations that can be analyzed readily in aqueous solution. These cations can be divided into five groups according to the solubility products of their insoluble salts (Table 16.5). Because an unknown solution may contain from one to all 20 ions, any analysis must be carried out systematically from [Pg.754]

Separation of Cations into Groups According to Their Precipitation Reactions with Various Reagents [Pg.754]

Group Cation Precipitating Reagents Insoluble Compound Ksp [Pg.754]

Adding acid to the solution shifts this equihbrium to the left so that only the least soluble metal sulfides, that is, those with the smallest values, will precipitate out of solution. These are Bi2Ss, CdS, CuS, HgS, and SnS. [Pg.601]

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