What does double decomposition by precipitation means? Give 5 day to day life example... Sir please answer this, I hope this information is enough for you to answer my question as tomorrow is my exams

Solution:
Double decomposition by precipitation is a type of chemical reaction occurring in an aqueous solution where two ionic bonds combine, resulting in the formation of an insoluble salt (precipitate).
Examples:
1) Clogging of pipes because of deposition of precipitates of magnesium and calcium oxides in "hard" water.
2) Kidney stones are precipitate of calcium ions (from cheese) and oxalates.
3) In wastewater, heavy metal ions are found such as compounds of sulfide and hydroxide. Upon addition of NaOH or Na2S, these metal ions are precipitated as sulfides and hydroxides.
4) Soluble antigens combine with soluble antibodies in the presence of an electrolyte at a suitable temperature and pH to form an insoluble visible complex in the human body.
5) Oxalic acid is mixed with seawater and brine water to extract calcium and magnesium as insoluble complexes.

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