Q3)Which one of the following best explains a comparison of the boiling points o
ID: 716907 • Letter: Q
Question
Q3)Which one of the following best explains a comparison of the boiling points of a 1.0 M aqueous glucose (C6H12O solution and a 0.80 M aqueous NaCI solution?
a) Since NaCI is a strong electrolyte and glucose is a nonelectrolyte, the boiling point of the O.80 M NaCl solution will be higher than the 1.0 M glucose solution.
b)Since the concentration of the glucose solution is higher than the NaCI, the boiling point of the sucrose solution will be higher.
c) Since the molar mass of glucose is larger than that of NaCI, the boiling point of the glucose solution will be higher than the boiling point of the NaCI solution.
Q4)Which of the following aqueous solutions would have the lowest vapor pressure at the same temperature?
a) 0.060 m HC2H302.
b) 0.050 m NaNO3.
c)0.045 m K2CO.
Q3)Which one of the following best explains a comparison of the boiling points of a 1.0 M aqueous glucose (C6H12O solution and a 0.80 M aqueous NaCI solution?
a) Since NaCI is a strong electrolyte and glucose is a nonelectrolyte, the boiling point of the O.80 M NaCl solution will be higher than the 1.0 M glucose solution.
b)Since the concentration of the glucose solution is higher than the NaCI, the boiling point of the sucrose solution will be higher.
c) Since the molar mass of glucose is larger than that of NaCI, the boiling point of the glucose solution will be higher than the boiling point of the NaCI solution.
Q4)Which of the following aqueous solutions would have the lowest vapor pressure at the same temperature?
a) 0.060 m HC2H302.
b) 0.050 m NaNO3.
c)0.045 m K2CO.
Q3)Which one of the following best explains a comparison of the boiling points of a 1.0 M aqueous glucose (C6H12O solution and a 0.80 M aqueous NaCI solution?
a) Since NaCI is a strong electrolyte and glucose is a nonelectrolyte, the boiling point of the O.80 M NaCl solution will be higher than the 1.0 M glucose solution.
b)Since the concentration of the glucose solution is higher than the NaCI, the boiling point of the sucrose solution will be higher.
c) Since the molar mass of glucose is larger than that of NaCI, the boiling point of the glucose solution will be higher than the boiling point of the NaCI solution.
Q4)Which of the following aqueous solutions would have the lowest vapor pressure at the same temperature?
a) 0.060 m HC2H302.
b) 0.050 m NaNO3.
c)0.045 m K2CO.
Explanation / Answer
Ans-3) When a non-volatile solute is added to a pure solvent, boiling point of the solution formed after adding the non-volatile solute will be higher than the boiling point of the pure solvent. This phenomenon is known as boiling-point elevation and is a colligative property of a solution.
Colligative property depends on the ratio of the number of solute particle to the ratio of the number of solvent molecules in a solution. It does not depend depend on the nature of the chemical species present in the solution.
We have 1.0M aqueous glucose solution and 0.80M aqueous NaCl solution. Since NaCl is an electrolyte, it breaks into Na+ and Cl- ions in the solution, so the number of particles in the NaCl solution becomes double as that of number of moles of NaCl in the solution. Glucose being a non-electrolyte remains as it is in the solution and no of particles remains same as that of number of moles of glucose in the solution.
So, the molarity of the total number of particles of NaCl in the solution becomes 2*0.80 = 1.6M
Therefore, number of particles in 0.80M aqueous NaCl solution is more than the number of particles in 1.0M aqueous glucose solution. So, here boiling point of NaCl solution is higher than that of glucose solution as NaCl is a strong electrolyte and glucose is a non-electrolyte.
Therefore option (a) is correct.
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