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Why is it when a solute is added to a pure liquid the boiling point increases and the freezing point decreases?
Wiki User
∙ 10y ago
Boiling point is the temperature at which the vapor pressure of the liquid equals atmospheric pressure. The vapor pressure of solvent molecules is decreased when a solute is added, so a higher temperature is required to increase the number of solvent molecules in the gas phase above the liquid. At the freezing point, the vapor pressures of the solid and liquid are equal; a lower temperature is needed to reduce the number of solvent particles above the liquid.
Wiki User
∙ 10y ago
Wiki User
∙ 6y agoThe solute contribute to the lowering of the vapour pressure of solvent and so to the lowering of freezing point.
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Does the salt decreases the melting point of ice?
Adding of any type of impurity in water decreases its melting point. You might have studied that depression in freezing point is a "colligative" property according to which adding of any impurity to a pure liquid decreases the melting point and increases the boiling point of that liquid. So, adding of salt is not the only method of decreasing the melting point.
How does the presence of a solute affect the freezing and boiling points of a solvent?
They usually lower freezing points, think antifreeze. And salt water freezes at a lower temp than fresh, that is why they put salt on ice. And they raise boiling points, think salt in water when making spaghetti. Or, again antifreeze.
What is the effect of a soluble and nonvolatile impurity on the boiling point of a liquid?
The presence of a non-volatile solute in a solution increases its boiling point. The amount of the elevation of the boiling point depends only on the number of molecules of solute present, and not on their identity. See the article entitled "Boiling-point elevation" on Wikipedia for the maths involved.
Is the boiling point of something the same as the melting point?
The boiling point is the temperature at which the vapor pressure of the liquid is equal to the external pressure. It is also the condensation point. The freezing point is the temperature at which liquid and solid coexist in equilibrium. It is also the melting point.
Liquid that freezes at 0 degrees Celsius and boils at 100 degrees Celsius?
The boiling point of water is 100 degrees Celsius.
Does the boiling point of a liquid decreases increases or stay the same if the intermolecular force increases?
Generally, the boiling point of a liquid increases if the intermolecular force, i.e. pressure, increases.
When atmospheric pressure increases what happpens to the boiling temperature of a liquid?
The boiling temperature of a liquid increases as the gas pressure a the liquid's surface increases.
What happens to the altitude and boiling point as the pressure is increased?
As altitude increases, pressure decreases, so boiling point decreases, so the liquid would boil at a lower temperature and would not be able to get as hot and remain a liquid. As pressure is increased, boiling point increases, meaning the liquid could get hotter than normal and remain a liquid.PV=nRT - pressure x volume = the number of moles x constant x temperature
Will a liquid turn to gas at its freezing point?
No it would be the boiling point. At freezing point it becomes solid
What do terms ''boiling point'' and '' freezing point '' mean?
Boiling point is the temperature at which a liquid changes into a gas. Freezing point is the temperature at which a liquid changes into a solid.
Does the salt decreases the melting point of ice?
Adding of any type of impurity in water decreases its melting point. You might have studied that depression in freezing point is a "colligative" property according to which adding of any impurity to a pure liquid decreases the melting point and increases the boiling point of that liquid. So, adding of salt is not the only method of decreasing the melting point.
When is the freezing point of a liquid?
effect of pressure and impurties on the freezing and boiling point of liquids
What happens to the temperature of a liquid as it changes from a liquid to a vapor?
The liquid vaporizes and the temperature increases as the volume also increases.
As the temperature of a liquid decreases the amount of a gas that can be disolved?
As the temperature of a liquid decreases the amount of gas that can be dissolved increases.
Which of these is defined as the change in physical state from liquid to gas occurring throughout a liquid?
freezing , boiling , evaporation, or condensation ?
What do terms boiling points and freezing point mean?
Melting (freezing) point: the temperature when the solid metal become a liquid. Boiling point: the temperature when the liquid metal become a gas.
How is the temperature of a liquid substance affected when it Is boiling?
it increases
