Homework Help: Chemistry

Posted by David on Sunday, April 12, 2009 at 8:54pm.

The experiment that I did in lab consisted of performing a qualitative analysis of group 1 and 2 cations and anions. The first thing that I did was to add 5 drops of 3M HCl, centrifuge it, and to observe whether a precipitate would form. It did and in the flowchart it signified that it was a Group I cation. My question is why do Group I cations form precipitates when mixed with HCl? (in this experiment)

Chemistry - DrBob222, Sunday, April 12, 2009 at 8:59pm
The best answer I can give is by asking a similar question: "Why is the color of an orange that color" or "Why is an apple green?" etc. A more sophisticated answer, but I don't know that it is better, is to say that the crystal lattice forces holding AgCl, Hg2Cl2, and PbCl2 together are stronger than the solvation forces from the dipoles of water; therefore, the lattice bonds are not broken and there is no solution.

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