According to Hardy-Schulze law :

1. Polarising power of flocculating ion is directly proportional to its power to cause precipitation.
2. Valence of flocculating ion is directly proportional to its power to cause precipitation.
3. Polarising power of flocculating ion is inversely proportional to its power to cause precipitation.
4. Both (1) and (2) 
 
Subtopic:  Colloidal Solution |
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It is essential to wash the precipitate with water before estimating it quantitatively . It is done to:

1. Make volatile product with solution.
2. Make it soluble in the solution.
3. Remove the adsorbed ions.
4. All of the above.
Subtopic:  Colloidal Solution |
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