Question

Give four example of precipitation reaction

Answer 1

The precipitate forms because the solid (AgCl) is insoluble in water. That is true for all precipitates - the solids are insoluble in aqueous solutions. ... For example, sometimes the pipes in our homes get clogged because precipitates of magnesium and calcium oxides have deposited themselves within the pipes.

Some examples of precipitation are rain, hail, sleet, and snow. Condensation is when cool air turns water vapor back into liquid and makes clouds.

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Answer 2

Take this rule into consideration: All nitrates are soluble and Ammonium, Potassium and Sodium salts are soluble.  

Precipitation reaction examples:  

Na2CO3 + Ca(NO3)2 --> 2NaNO3 + CaCO3  

2NaOH + MgCl2 --> 2NaCl + Mg(OH)2  

NiCl2 + Na2CO3 --> NiCO3 + 2NaCl