How does the boiling point of a solution depend on the amount of solute in it?

Answer 1

Two things affect the boiling point.

#1 the gas pressure above the solution.

The higher/lower the gas pressure above a solution will increase/decrease the boiling temperature.

#2 the amount of solute in the solvent.

There is a whole lot of chemistry on the ebullioscopic constants and cryoscopic constants.

However, a solution will boil at a higher temperature , than the corresponding solvent.

Similarly a solution will freeze at a lower temperature, than the pure solvent.

Answer 2

yes it does? ??? The point at which a liquid boils depends on the atmospheric pressure applied to the liquid and the type of liquid itself. Granted, a smaller amount of liquid will boil sooner than a larger amount of liquid only because the smaller amount of liquid was able to reach the boiling temperature sooner but the temperature at which both amounts of liquid will boil will be the same temperature. At sea level water (regardless of the quantity) will boil at approximately 100 degrees celcius (212 degrees F).

Answer 3

I am not sure please help me

If you take 200 ml of water in one pan and 1000 ml of water in another pan and apply the same amount of heat to both pans, the one with the 200 ml will boil first. Not because it has a lower boiling point, but because the heat applied was able to raise the water to the boiling temperature sooner because of the lesser amount of volume needing to be heated. It still must reach approximately 100 degrees C to boil at sea level. The pan containing the 1000 ml of liquid will eventually boil when the liquid has also reached the required temperature. The liquid in both pans will have achieved the necessary temperature to boil (which is the same in both pans) however the smaller pan will boil first because of the smaller amount of liquid.

Answer 4

When there is a large amount of solute in a solvent, the vapor pressure of the resulting solution is less than the vapor pressure above the pure solvent. The boiling point of a solution, then, will be greater than the boiling point of the pure solvent. The change in the boiling point is roughly proportional to the amount of solute in a solvent.Intially it is almost exactly proportional but begins to become non-linear as the amount of solute increases.

Answer 5

The more concentrated a solution, the higher its boiling point will become.

In example, regular water boils at a lower temperature than does salt water. This is because the salt in the water increases the solutions concentration.

Answer 6

It doesn't per se. The boiling point of a liquid is defined as the temperature at which the liquid will change from a liquid to a gas. That temperature depends on the pressure on the liquid rather than the volume. The only impact volume has on boiling is that, assuming all things are constant, more volume means more mass of the liquid, which means it would take more energy to heat the liquid to the boiling point. For example, it would take twice as long to heat 2 liters of water as it would to heat 1 liter of water to boiling using the exact same heat source.

Answer 7

The boiling point is defined as the temperature at which the vapor pressure of a fluid equals the surrounding ambient pressure.

When you have a mixture of different substances with different vapor pressures, the boiling point will be the temperature at which the sum of the fraction of each substance times the vapor pressure at that temperature equals the surrounding ambient pressure.

For example, a mixture of water (vapor pressure = 1 atmosphere at 100 deg C) methanol (vapor pressure = 1 atmosphere at 65 deg C) will be somewhere between 100 C and 65 C depending on the fraction of each.

Let's just say, for simplicity, it boils at 85 deg C. Then go find the vapor pressure of water and methanol at 85 deg C. It will be less than 1 atmosphere for water, and way more than 1 atmosphere for methanol. Then you create an equation that looks like this (where X = fraction of water):

[X * vapor pressure of water at 85 deg C] + [(1-X) * (vapor pressure of methanol at 85 deg C)] = 1 atmosphere

and solve for X. You just found out what the fraction of water and methanol was in the mixture. If you already know this and want to know the temperature at which it will boil, use the same equation and solve for vapor pressure, then look up what temperature corresponds to that vapor pressure. Easy!

Answer 8

No, the boiling point (boiling temperature) of a liquid is a property of that substance. But the boiling temperature would be affected by the pressure of the surrounding air. Water will boil at lower temperature when the air pressure surrounding the water is lower. Sometimes you will see on cooking directions different cooking times for higher elevations, due to the lower boiling temperature (and therefore less energy in the boiling water available to transfer to the food).

Answer 9

No. Boiling point is the temperature at which water boils. Whether it is a teaspoon or a bathtub full, they boil at the same temperature- 212 degrees F at sea level. Now, the bathtub of water will require much more heat to GET to 212 degrees.

Answer 10

yes. no matter the amount of the water, it must still reach 212 degrees Farenheit to boil at sea level. The boiling point is the temperature, not the amount.