Friday, November 4, 2011

Chemical Reactions and Temperature Lab

In this experiment, we dropped an Alka-Seltzer into different temperatures of water to see what would dissolve faster.  We predicted that the hotter the temperature got the faster it would dissolve.  The hot water was at 50 degrees Celsius and it took 20 seconds to fully dissolve.  The room temperature water was at 25.1 degrees Celsius and took 27 seconds.  Finally, the cold water took a minute and 56 seconds to dissolve at 0.8 degrees Celsius.

Alka-Seltzers are made of NaHCO3 and once you combine it with H2O you create CO2.  The CO2 are in the bubbles created by the two, Sodium bicarbonate and water, combining.  The heat makes the water molecules bounce off each other faster to break the tablet faster. 

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