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Which of the aqueous solutions below will have the highest boiling point? 0.070 m LiBr 0.050 m Ca(NO3)2 0.070?

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  • Which of the aqueous solutions below will have the highest boiling point? 0.070 m LiBr 0.050 m Ca(NO3)2 0.070?


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Answer #1 | 11/02 2014 06:32
Consider... 0.070 m LiBr 0.050 m Ca(NO3)2 Boiling point elevation, due to the dissolving of a solute in a solvent, is a colligative property, and as such, depends on the concentration of particles dissolved in the solvent. The greater the concentration of particles, the greater the boiling point elevation (and freezing point depression.) LiBr(s) --H2O-> Li+ + Br- The resulting particle concentration for 0.07m LiBr is 0.14m. Two particles are produced for each formula unit of LiBr Ca(NO3)2(s) --H2O-> Ca2+ + 2NO3^- The resulting particle concentration of 0.05m Ca(NO3)2 is 0.15m. Three particles are produced for each formula unit of Ca(NO3)2. Conclusion: The calcium nitrate will elevate the boiling point to a greater extent.

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