Ice melts at 0 oC. Water boils at 100 oC. When a little salt is added to pure water, the melting point will __________ and boiling point will __________.
Question
Ice melts at 0 oC. Water boils at 100 oC. When a little salt is added to pure water, the melting point will __________ and boiling point will __________.
Solution
When a little salt is added to pure water, the melting point will decrease and the boiling point will increase. This is due to the fact that salt disrupts the equilibrium of the water molecules, requiring more energy (higher temperature) to change from liquid to gas, thus raising the boiling point. Conversely, the addition of salt also lowers the temperature at which water freezes, effectively lowering the melting point.
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