![]() ![]() Iodide is a very soluble ion, and is only insoluble when combined with silver (Ag) or lead (Pb). We believe that the cation in the nitrate solution is either sodium (Na), lead (Pb), or silver (Ag).īecause of this, we decide to add 10 mL of potassium iodide (KI) to the test tube. One way to determine its identity is by reacting the solution with another aqueous solution to produce a precipitate. We have a test tube containing 50 mL of an unknown nitrate solution. To show what I mean, let's do an experiment. Precipitation reactions can be helpful for determining what ions are in a solution. However, you don't necessarily need to write them in that order. I swapped the order of Ag and Cl in the equation, since we normally write the cation first. ![]() Now that we know the basics, let's look at some equations.
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