Q.
58.5 g of NaCl and 180 g of glucose were separately dissolved in 1000 mL of water. Identify the correct statement regarding the elevation of boiling point (bp) of the resulting solution.
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a
NaCl solution will show higher elevation of boiling point
b
glucose solution will show higher elevation of boiling point
c
both the solutions will show equal elevation of boiling point
d
the boiling point elevation will be shown by none of the solutions
answer is A.
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Detailed Solution
Elevation in boiling point, ∆Tb=i×Kb×mMolality of NaCl solution =nw×1000 =58.558.5wH2o×1000=1000wH2oMolality of C6H12O6solution =180180×1000wH2O=1000wH2OBoth solutions have same molality but values of i i.e. van't Hoff factor for NaCl and glucose are 2 and 1 respectively.Hence, NaCl will show higher elevation in boiling point.
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