Question

solutions of sodium fluoride and dilute hydrochloric acid are mixed

Answer 1

The reaction between sodium fluoride and dilute hydrochloric acid yields Hydrogen fluoride and sodium chloride. The equation for the reaction is;
   NaF + HCl = HF + NaCl
   Na ⁺ + F⁻ + H⁺ + Cl⁻ = HF + Na⁺ + Cl⁻
   The net ionic equation :
       F⁻ + H⁺ = HF