======Temperature and Solubility of Salt vs. Sugar======


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**Alternative titles:** Hot vs. Cold Water Dissolving Demonstration
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====Summary====                   
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====Procedure====  
  - Label two small cups “salt” and two small cups “sugar.”
  - Place one tablespoon of salt in each salt cup and one tablespoon of sugar in each sugar cup.
  - Pour 25 mL of hot water (about 50 °C) into one graduated cylinder and 25 mL of cold water (about 5 °C) into another.
  - At the same time, pour salt from the two salt cups into the hot and cold water cylinders without stirring.
  - Repeat the same process with sugar in two more graduated cylinders.
  - Observe and compare the amount of undissolved solid left in each cylinder.



====Links==== 
Video lab: Solubility & Temperature - ScienceGonnaGetYou: 
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📄 Does Temperature Affect Dissolving? - ACS: [[https://www.acs.org/middleschoolchemistry/lessonplans/chapter5/lesson6.html]]\\


====Variations====
  * Stir the solutions gently and compare results with unstirred samples.
  * Try using other solutes, such as baking soda, to see how temperature affects their solubility.



====Safety Precautions====
  * Wear chemical splash goggles.
  * Handle hot water carefully to avoid burns.
  * Use stable graduated cylinders to prevent tipping.




====Questions to Consider====
  * Does sugar dissolve more in hot water or cold water? (Sugar dissolves more in hot water.)
  * Does salt dissolve more in hot water or cold water? (Salt shows little difference between hot and cold water.)
  * Why does sugar’s solubility increase more with temperature than salt’s? (Molecular differences cause sugar to interact more strongly with water as temperature rises.)