Purpose: This experiment is being performed because it shows how ions react together in a solution. We can learn how solubility works and determine the identity of an unknown solution.
Questions: Are there any silver, strontium, and/or zinc ions in the number 3 unknown solution.
Introduction:
Some chemical substances have high solubility; those chemical substances can dissolve in water. Some chemical substances have very low solubility, if you put those chemical in water, it will product precipitate. On the basis of solubility, we can determine what chemical ions solution has. For example, this #3 unknown solution have silver, strontium or zinc ions. When we put Cl- with Ag+ Pb2+ Ti+ Hg+ and Hg2+ together, they all have very low solubility, and product precipitate. This solution only probably has Ag+ in Ag+ Pb2+ Ti+ Hg+ and Hg2+, so if we put Cl-- into the solution and product precipitate. It means there is Ag+ in this solution. By parity of reasoning, if we put OH— into the solution, and product precipitate. It means there is Zn2+ in the solution; and also if we put SO42— into the solution, and product precipitate. It means there is Sr2+ in the solution.
