ollowing questions all relate to the normal boiing point of water where the atmo
ID: 1076372 • Letter: O
Question
ollowing questions all relate to the normal boiing point of water where the atmospherie pressure is defined to be 1 atm. a. What is the boiling point of pure water? b. If a nonvolatile, insoluble substance is mixed with water, will the boiling point of the mixture be above, below or the same as the boiling point of water? c. If a nonvolatile substance is dissolved in water, will the boiling point of the mixture be above, below or the same as the boiling point of water? d. What is the temperature of the vapor above a sample of boiling water? If a nonvolatile, insoluble substance is mixed with water, will the temperature of the vapor above the boiling mixture be above, below or the same as the boiling point of water? e. If a nonvolatile substance is dissolved in water, will the temperature of the vapor above the boiling mixture be above, below or the same as the boiling point of water? f.Explanation / Answer
a) The boiling point of pure water is 100 C or 373 K
b) If non volatile insoluble compound is added to water, the boiling point would remain same, as it does not affect the vapour pressure of water.
c) If non volatile soluble compound is added to water, the boiling point of solution increase as vapour pressure of water decreases so we have to heat at higher temperature to make it equal to external pressure.
d) The temperature of the vapour above a sample of the boiling water is 100 C
e) If a non volatile insoluble compound is added, than temperature of vapour will be same as that of boiling water, that is 100 C
f) If a non volatile soluble compound is added, than temperature of the vapour above the boiling mixture would be at higher temperature than the boiling point of water as boiling point of mixture increases.
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