If those two substances were the only ones in the solution there will be no reaction. Reactions occur for one of just a few reasons.
1. A ppt is formed. Nothing insoluble here.
2. A gas is formed. No gas can be formed here.
3. A slightly ionized material is formed. Both NaCl and NaF are completely ionized.
4. A redox reaction occurs. There is nothing here to be "redoxed".
Suppose you tired to carry out a double-replacement reaction by mixing together equal volumes of a solution that contained dissolved NaF and a solution that contained dissolved NaCl. Would you expect a reaction, if so write the balanced chemical equation?
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