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Because salt raises the temperature of the water so it reaches its boiling temperature faster.

Q: "Why does salt water boil more quickly than pure water"

A: "salt raise the temperature of the water"

Two remarks:1. The Q. is wrongly stated and should be corrected while answering (see below).2. The A. is a 'wrong' answer to 'another' Q.

"More quickly" means (in my opinion) 'at a lower temperature', thus water with salt boils at a HIGHER temperature than pure water (100 dgr.C).

This is because of the ions (+ and -) nesting in between the water molecules and add contraction forces between them.

(Cf. the addendum in the improved answer, below 2nd line)

Minor edit by another contributor: yeah, that's what I always thought too (that salt makes water take longer to boil). But I thought it was just me being an idiot again.

Higher boiling point

The answer to the question why do bubbles form when water is boiled? explains how, as the temperature of water rises, its molecules move around faster, collide more often and release more water vapor gas molecules. When the temperature reaches boiling point - about 100°C (212°F) - the pressure from the release of these molecules (the vapor pressure) becomes greater than atmospheric pressure and water vapor starts to escape as bubbles.

In salty water, Na+ and Cl- ions occupy some of the space between the water molecules. As temperature increases, although the water molecules are moving faster, there are less of them, so there are fewer collisions, less release of water vapor molecules and lower vapor pressure compared to pure water at the same temperature. It takes more energy (temperature) for the vapor pressure of salt water to reach and exceed atmospheric pressure and start to boil.

To raise the boiling point of one liter (34 ounces) of water by 1°C (1.8°F) requires about 58 grams (2 ounces) of salt. This is much more that the amount of salt typically added to boiling vegetables, which is done primarily for taste.

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15y ago

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Does salt water boil faster than plain?

Salt (or anything dissolved into water) will increase the boiling point of water. It will take longer to come to a boil. Salt reduces the vapor pressure of the water and so requires a higher energy level to boil.


What evaporates faster water with salt or plain water?

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How does adding salt to water effect how it boils?

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What would a diagram look like for the question Does salt water boil faster than plain water?

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