1. would boiling point elevation change if the atmospheric pressure changed duri

Question

1. would boiling point elevation change if the atmospheric pressure changed during the experiment? explain.

2. an unknown compound is suspected to be a group 1 metal/chloride salt of identity lithium chloride, sodium chloride, or potassium chloride. if 4.934 grams of salt is dissolved in 50.235 grams of water and yields a freezing point depression of -8.72 °C, give the identity of the salt.

3. one very plausible source of error in the freezing point depression portion may be the effect of ion pairing. what affect would this have in the freezing point depression and the calculated molar mass of the sample? explain.

4. some salts work better than salt to melt ice on driveways and roads not only because they depress the freezing point, but because they have a negative enthalpy of solution. propose a salt that might work in this manner.

Explanation / Answer

1) -

Boiling point is the temperature at which vapour pressure of the liquid becomes equal to that of atmospheric pressure. If the atmospheric presuure increases than boiling point decreases and if atmospheric pressure decreases boiling point decreases. hence, boiling point elevation change if the atmospheric pressure changed.

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