Differenciate between coprecipitation and post precipitation.

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Solution

Co-precipitation
Post precipitation
1. Co-precipitation is a kind of precipitation where soluble compounds in a solution are eliminated during the course of precipitation. 1. Post-precipitation is a kind of precipitation where the precipitation of the undesirable compound occurs after the formation of the precipitate of the desired compound.
2. The degree of contamination of reaction is high. 2. The degree of contamination is low.
3. It is the precipitation that transpires simultaneously by more than one soluble component in a single solution. 3. It is the precipitation that transpires as a layer upon the already formed precipitate.
4. For example, the separation of francium ( $Fr$ ) from other radioactive elements by co-precipitating it with caesium $(Cs)$ salts such as caesium perchlorate ${CsClO}_{4}$ ). 4. For example, the formation of calcium oxalate ( ${CaC}_{2} O_{4}$ ) after the precipitation of magnesium oxalate( ${MgC}_{2} O_{4}$ ).

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Co-precipitation	Post precipitation
1. Co-precipitation is a kind of precipitation where soluble compounds in a solution are eliminated during the course of precipitation.	1. Post-precipitation is a kind of precipitation where the precipitation of the undesirable compound occurs after the formation of the precipitate of the desired compound.
2. The degree of contamination of reaction is high.	2. The degree of contamination is low.
3. It is the precipitation that transpires simultaneously by more than one soluble component in a single solution.	3. It is the precipitation that transpires as a layer upon the already formed precipitate.
4. For example, the separation of francium ( $Fr$ ) from other radioactive elements by co-precipitating it with caesium $(Cs)$ salts such as caesium perchlorate ${CsClO}_{4}$ ).	4. For example, the formation of calcium oxalate ( ${CaC}_{2} O_{4}$ ) after the precipitation of magnesium oxalate( ${MgC}_{2} O_{4}$ ).