The Case of the UNLABELED BOTTLES

B. Reactions of Unknown Solutions
1. Clean the test tubes from Part I.
2. Place the clean test tubes in a pattern following the unshaded boxes of Table 2.
3. Mix the appropriate unknown solutions together and write the results in Table 2.
4. Dispose of the waste in the sink, rinse the test tubes and return them to the box.
5. Compare the reactions of the known solutions with the reactions of the unknowns. Use the comparison to
identify the unlabeled bottles.
Solubility Rules for CHM 111
(recall that you begin with rule 1 and stop at the first rule that applies).
1. All nitrate (NO3 − ) salts are soluble.
2. All salts containing the alkali metal ions (especially Na + and K + ) or the ammonium (NH4 + ) ion are soluble.
3. Most Cl − , Br − , and I − salts are soluble. Insoluble exceptions: Ag + , Pb 2+ and Hg2 2+ .
4. Most sulfate (SO4 2− ) salts are soluble. Insoluble exceptions: PbSO4 , Hg2SO4, BaSO4, CaSO4, SrSO4
5. Most hydroxide salts are only slightly soluble (mostly insoluble). The important soluble hydroxides are
NaOH and KOH. The compounds Ba(OH)2, Sr(OH)2 and Ca(OH)2 are soluble at low concentration
(