The fluoride ion reacts with water to produce HFHF. Part A Write out the chemical equation for this reaction. Express your answer as a chemical formula. Include the physical states.

The chemical reaction is ;

Explanation:

The chemical reaction of formation of hydro fluoric acid  by reaction of fluoride ions and water is given by :

According to reaction, when 1 mole of fluoride ions react with 1 mole of water they give hydro fluoric acid  and hydroxide ions as product.

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.