What is chief source of precipitations?

What is the condition of precipitation using solubility product principle?

What is precipitation?

The chief source of vitamin D is

When potassium iodide solution is added to a solution of lead nitrate in a testtube, a precipitate is formed. What is the colour of this precipitate? Name the compound precipitated.

When the solution of sodium carbonate is added to the solution of calcium chloride, a precipitate is formed. a. What is the colour of the precipitate formed? b. Name the precipitate. c. What is the type of the chemical reaction?

What is coagulation or precipitation of colloids?