Here's what happens:
1. Reactants: Ferric chloride (FeCl₃) is a yellow-brown solid, and sodium hydroxide (NaOH) is a white solid that dissolves in water to form a strong base.
2. Reaction: When these two compounds are mixed in solution, the positively charged iron ions (Fe³⁺) from ferric chloride react with the negatively charged hydroxide ions (OH⁻) from sodium hydroxide.
3. Product Formation: This reaction forms ferric hydroxide (Fe(OH)₃), which is a reddish-brown solid that precipitates out of the solution. The other product is sodium chloride (NaCl), which remains dissolved in the solution.
The balanced chemical equation for this reaction is:
FeCl₃(aq) + 3NaOH(aq) → Fe(OH)₃(s) + 3NaCl(aq)
Key observations:
* Precipitate: The formation of the reddish-brown precipitate of ferric hydroxide is the most noticeable observation.
* Color change: The solution initially may be yellowish-brown due to the ferric chloride. As the reaction proceeds, the solution will become clearer as the ferric hydroxide precipitates out, leaving a colorless solution of sodium chloride.
This reaction is used in various applications, including:
* Water treatment: Ferric chloride is used as a coagulant in water treatment to remove suspended solids.
* Wastewater treatment: It helps in removing heavy metals and other pollutants from wastewater.
* Chemical synthesis: It serves as a precursor in the synthesis of other iron-containing compounds.
