======Effect of Particle Size on Solubility======


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**Alternative titles:** Solubility and Surface Area
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====Summary====                   
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====Procedure====  
  -Prepare two equal amounts of table salt (about one teaspoon each).  
  -Leave one sample as uncrushed salt crystals.  
  -Crush the second sample into smaller particles using a mortar and pestle or the back of a spoon.  
  -Pour equal amounts of warm water (about 100 mL) into two clear glasses or beakers.  
  -Add the uncrushed salt to one glass and the crushed salt to the other at the same time.  
  -Stir both solutions gently and observe which sample dissolves faster.  
  -Record observations and note the time taken for each sample to dissolve completely.



====Links==== 
The Effect of Particle Size on Solubility - Joedelyn Cruz: 
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Effect of particle size on dissolution of a substance in water - Learning Factory: 
{{youtube>vGNfHBmyZwM?}}\\


====Variations====
  *Repeat the experiment with sugar or other soluble solids.  
  *Try using cold and hot water to observe how temperature affects solubility rate.  
  *Use different crushing degrees (fine powder vs coarse grains) to see how surface area impacts dissolving time.



====Safety Precautions====
  *Handle glassware carefully to prevent breakage.  
  *Use warm, not boiling, water to avoid burns.  
  *Do not taste the solutions.  
  *Clean all equipment thoroughly after the experiment.




====Questions to Consider====
  *Which sample dissolved faster—crushed or uncrushed salt? (Crushed salt.)  
  *Why did the crushed salt dissolve faster? (Smaller particles have a greater surface area exposed to water molecules.)  
  *Does particle size affect how much solute can dissolve in water? (No, only the rate of dissolving changes, not the total solubility.)  
  *What other factors besides particle size can affect dissolving rate? (Temperature, stirring, and solvent type.)