What is an example of a precipitation reaction that is used in everyday life or in the industry?
I need an example of a precipitation reaction that is used around us in normal life or is common in the industry.
A common place where precipitation is used is in treatment of wastewater. If a contaminant can form an insoluble solid then we can precipitate out the contaminant ion(s). A frequent concern in wastewater treatment is the presence of heavy metals in water. Since many hydroxide and sulfide compounds of heavy metals are insoluble in water, we can add a source of hydroxide that is soluble (i..e NaOH or Na2S) that will result in the precipitation of the heavy metal hydroxide.
Pb2+ + Na2S --> PbS + Na+
The lead sulfide is then an insoluble precipitate and can be filtered out of the water to remove the lead sulfide.