Saturday, 8 September 2012

Effect of Heat on dissolving Sugar

Things You Need
  • Sugar cubes
  • Cold water in a clear glass
  • Hot water in a clear glass (be careful with the hot water)
  • Spoon for stirring

The Way You Do
  1. Make sure the glasses have an equal amount of water.
  2. Put a sugar cube into the cold water and stir with the spoon until the sugar disappears. Repeat this process (remembering to count the amount of sugar cubes you put into the water) until the sugar stops dissolving, you are at this point when sugar starts to gather on the bottom of the glass rather than dissolving.
  3. Write down how many sugar cubes you could dissolve in the cold water.
  4. Repeat the same process for the hot water, compare the number of sugar cubes dissolved in each liquid, which dissolved more?

What You Observe 

The cold water isn't able to dissolve as much sugar as the hot water, but why? Another name for the liquids inside the cups is a 'solution', when this solution can no longer dissolve sugar it becomes a 'saturated solution', this means that sugar starts forming on the bottom of the cup.

The reason the hot water dissolves more is because it has faster moving molecules which are spread further apart than the molecules in the cold water. With bigger gaps between the molecules in the hot water, more sugar molecules can fit in between. 


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