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Aqueous Solution and Oxidizing Agents

37) Which the following aqueous solutions has the highest boiling point?
a) 0.10 M potassium sulfate
b) 0.10 M HCl acid
c) 0.10 M ammonium nitrate
d) 0.10 M magnesium sulfate
e) 0.20 M sucrose

38) When 70 ml of 3.0 M Nasub2COsub3 is added to 30 ml of 0.1 M NaHCOsub3, the resulting concentration of Na+ is?

39) Which of the following species cannot function as oxidizing agent?

a) Crsub2Osub7^2-
b) MnOsub4^-
c) NOsub3^-
d) S
e) I^-

Solution Preview

37) We expect the boiling point to be higher for salt solutions with highly ionic character than a solution of sugar (here: sucrose), even if its concentration is a bit higher. Amongst the ionic salt solutions (choices a to d), we expect the boiling point to be higher for the ionic salt solution of a divalent positive (2+) ion, which is Mg2+ here (all their concentrations ...

Solution Summary

37. We expect the boiling point to be higher for salt solutions with highly ionic character than a solution of sugar (here: sucrose), even if its concentration is a bit higher. 38. The resulting concentration of the Na+ is going to come from the number of moles of Na+ from both solutions calculated for the total volume of the two solutions. 39. A species cannot function as oxidizing agent if its oxidation number is the lowest possible for the given atom/ion.

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