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======The Lost Volume Demonstration======


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**Materials: **{{$demo.materials_description}}\\
**Difficulty: **{{$demo.difficulty_description}}\\
**Safety: **{{$demo.safety_description}}\\
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**Categories:** {{$demo.categories}}
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**Alternative titles:** Volumes Don't Always Add Up, 50 Plus 50 Doesn't Always Equal 100.
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====Summary====                   
{{$demo.summary}}


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/* PROCEDURE - Optional                                                                                */
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====Procedure====  
  - Measure 250 mL of water and pour it into a beaker or graduated cylinder.  
  - Measure 250 mL of ethyl alcohol in a separate container.  
  - Slowly combine the two liquids into one container.  
  - Observe and record the total volume of the mixture, it should be significantly less than 500mL.


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====Links==== 
Volumes Don't Always Add Up - Flinn Scientific: 
{{youtube>QNJyyVwzYMY?}}\\
📄 The Lost Volume Demonstration - Carolina Knowledge Center: [[https://knowledge.carolina.com/professional-growth/activities/the-lost-volume-demonstration/]]\\


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====Variations====
  * Try mixing different ratios of water and alcohol to see how the volume reduction changes.  
  * Use other alcohols (such as isopropanol) to compare volume contraction.


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====Safety Precautions====
  * Keep alcohol away from open flames or sparks, as it is highly flammable.  
  * Conduct the experiment in a well-ventilated area to avoid inhaling vapors.  
  * Do not ingest alcohol or dispose of it down the drain without proper guidance.


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====Questions to Consider====
  * Why does the total volume decrease when water and alcohol are mixed?  
  * How do hydrogen bonding and molecular structure explain the volume contraction?  
  * What does this experiment suggest about the difference between mass conservation and volume conservation?


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/* Complete information in the Demonstration Info box below, following instructions exactly. */