A double replacement equation will not result in a reaction if both products are soluble.
When two ionic compounds exchange ions to create two new ionic compounds, this is known as a double replacement reaction. An illustration of this kind of answer is the following: AD + CB + CD + AB.
Since salt is an insoluble substance that won't dissolve in water, we use the symbol (s) for solid. If there had been no precipitate formation, the silver, fluoride, potassium, and chloride ions would have in fact relocated to a different site, but they would still be floating around as ions. In this case, nothing happens.
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