This is an example of a precipitation reaction. A precipitation reaction is one where two aqueous solutions react to produce a precipitate. A precipitate is an insoluble solid that emerges from a liquid solution. A precipitation reaction can also be classified as a double replacement reaction.
We can predict which product in a precipitation reaction will be insoluble by consulting a list of solubility rules. You can find a list of solubility rules online or in your textbook.
The two products of the reaction are potassium nitrate ( ) and silver dichromate (
).
The solubility rules for nitrates and chromates are as follows:
Nitrates: Nitrates are always soluble.
Chromates: Chromates are usually insoluble.
Therefore, we would predict that silver dichromate is insolule and forms the solid precipitate seen at the bottom of the mixing vial.
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