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The presence of the impurities will cause the boiling points to rise (also the melting points to fall). When you add the impurities, the substance doesn't remain pure affecting the boiling point to increase because now, more energy is required to boil the liquid with impurities.

The melting points fall because impure substances require less energy to separate the particles.

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โˆ™ 2013-05-24 19:00:24
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Q: Why do impurities lower the boiling point of a pure substance?
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Related questions

What do impurities do to both boiling points and melting points of substance?

impurities lower the magnitude of melting point of as substance. And it increases the magnitude of boiling point.


What may happen to the boiling point of a substance if there are impurities present?

The boiling point won't decrease


What does the boiling point of a liquid indicate?

it indicates the impurities of a substance


What happens to the melting and boiling point of a substance if it contains impurity?

The boiling point may increase or decrease if a substance contains impurities.


What happen when boiling point increase or decrease?

The boiling point of a substance depend on the pressure and the impurities contained.


How does impurities affect the boiling point of liquid?

Let's say substance A is the substance and substance B is the impurity. The boiling point of the mixture would be somewhere between that of A and B, depending on the amount of impurities in the mixture.


Will there be effect on melting or boiling point of a substance if another substance is added to it?

Yes, impurities have important effects on the melting and boiling point of materials.


Why can volatile impurity increase the boiling point of a substance?

It is not true, the volatile impurities decrease the boiling point of a liquid.


Why impure substance have higher boiling point?

Because a solution with impurities has a lower volatility. The mole fraction of the solvent is also decreased.


What is the boiling point of water with impurities?

Anything that is dissolved in water will cause the boiling point to rise (and the freezing point to lower).


How does one increase the melting or boiling point of a substance?

Add impurities (salt and others) to the substance.


Importance of boiling point?

Knowing the boiling point of a substance provides information to determine what the substance is if its unknown. If you are making a substance, checking the boiling point will let you know if you have made what you set out to make, (because impurities can mess up the boiling point)


How does impurities and altitude affect boiling or freezing point?

Altitude: higher you go, the lower the boiling point. At the top of Mount Everest, water boils at 67centigrade. Impurities: increase the boiling point. In science we say, the bp is elevated by impurities.


Does impure water boils at 100 C?

No. Impurities increase the boiling point of a substance.


Why do impurities increase the boiling point of water?

The boiling point of water increases on adding impurities because the boiling point of the impurities also adds up to the boiling point of water thus increasing it.


What may happen to the boiling point of the substance if there are impurities present?

The boiling point will increase. The impurities essentially "block" the molecules of the substance from leaving the liquid as a gas, so a higher temp is needed to boil it. see colligative properties.


How do impurities affect the melting and boiling points of water?

the presence of impurities decrease the melting or freezing point of water but the nonvolatile impurities increase the boiling point and volatile impurities decrease the boiling point of water


What may happen to the boiling point of a substance if there are impurities present. Explain in terms of the nature of impurities.?

it might decrease or increase depends on the impurities added.:D


How does a substance's boiling point determine its state at room temperature?

If the substance's boiling point is lower than room temperature, it is probably a gas. If the boiling point is higher, it will be a liquid.


Why tap water evaporates so fast?

Impurities in water lower the rate of evaporation because impurities increase the boiling point.


How does IMF affect the boiling point or melting point of a substance?

The stronger the IMF, the higher the boiling point and the lower the melting point. The weaker the IMF, the lower the boiling point and the higher the melting point.


Is distillate the substance with lower or higher boiling point?

the distillate


How does impurities affect the boiling points of liquids?

Impurities raise the boiling point of liquids.


What is the effect of impurities on the melting point of ice and the boiling point of water?

Dissolved particles (ions, molecueles) will make the melting point somewhat lower and the boiling point higher.


How is the melting point of asolid and boiling point of a liquidaffected when impurities are added to the substances?

Adding impurities lowers the melting point and raises the boiling point.