freezes at 0°C, however this temperature reading is widely
dependent on the substances that are present in the water. When
dissolving a substance in water, the freezing point will be
lowered, meaning that the temperature has to be colder in order for
the water to completely freeze. This is called, The Depression of
Freezing Point. Many foreign substances, such as alcohol, sugar
and salt, can interrupt the balance of melting and freezing water
at 0 degrees Celsius. This has a direct link to the melting point
of ice as melting point and freezing point both are 0°C.
When the temperatureof water reaches a freezing point, the free flowing molecules get trapped into organized crystal structures creating ice. However, when salt is introduced it disrupts the process. When in contact with water, it splits up into two ions, being Sodium and Chloride (NaCl). These ions move around in between the structure which then leads to the ice melting due to the lowering to the freezing point which means more water molecules are leaving and less are entering the solid. When the temperature lowers even further, the water molecules leaving the solid phase will slow down even further and the rate will eventually match the rate at which water molecules can find the solid in the presence of salt. When water leaves a solid at the same rate as molecules enter, a lower freezig point is established. show more content
The test that will be conducted uses 500ml of water and different levels of salt and sugar. Salt and sugar, the solutes, being the independent variables, will allow the experiment to test the melting rate of ice at different concentration levels. By adding salt and sugar in to separate ice trays after diluting it and freezing it, the freezing point should be lowered, meaning that the rate at which the ice will melt will decrease. This would also be the case if sugar was used along with
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