GeoChem Challenge #2 - Isolation Mystery Cache

This geocache is part of the GeoChem Challenge Series celebrating the international Year of Chemistry 2011.

The International Year of Chemistry will celebrate the achievements of chemistry and its contributions to the well-being of humankind.
Celebrate Chemistry - our life, our future.

The Mystery of the Seven Test Tubes

Somebody has filled seven test tubes with seven different solutions and labeled them with a letter code. The actual identity of each solution is a mystery. You are the chemical detective and it is your mission to correctly identify each solution, matching the letter with the number in the chart below in order to find the exact location of the cache.
Since there are over ten million registered compounds, this would seem to be an impossible task. In this case, however, you are in luck! All the other compounds have an alibi for the time in question and we know for certain what the seven solutions are.
Here is the line-up:

A = NaI
B = H2O
C = Na2CO3
D = AgNO3
E = HCl
F = Pb(NO3)2
G = NaCl

This kind of process is called qualitative analysis. Procedures in qualitative analysis often involve precipitation reactions. Good luck! You´ll need it.

To find this cache some knowledge of qualitative analysis is required.

Happy caching!