I've always though it did, but shouldn't it slow it down? Because it raises the boiling point temperature?
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NO, not at all. It raises the boiling temp slightly, so yes, it would take slightly longer for it to reach a boil, not quicker.
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Adding table salt to water lowers the boiling point of the water, so the water doesn't have to get as hot in order to boil.
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A non-volatile solute when added to a solvent ddcreases the boiling temperature because it is a colligative property?