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GRE Subject Test: Chemistry : Boiling Point

Study concepts, example questions & explanations for GRE Subject Test: Chemistry

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Example Questions

Example Question #1 : Physical Chemistry

Two moles of sodium chloride (NaCl) are added to 1kg of a mystery solvent. The addition of the NaCl caused an increase of 6K to the solvent's boiling point.

Based on this information, what is the boiling constant for the solvent?

Possible Answers:

$k_{b} = 3.0\frac{K}{m}$

$k_{b}= 1.0\frac{K}{m}$

$k_{b} = 1.5\frac{K}{m}$

$k_{b}= 6.0\frac{K}{m}$

Correct answer:

$k_{b} = 1.5\frac{K}{m}$

Explanation:

In order to solve this problem, we can use the boiling point elevation equation: $\Delta T = k_{b}mi$ .

We know the temperature change, we can compute molality from the given information, and we know the van't Hoff factor (expected to be 2 in this scenario due to NaCl becoming 2 ions in solution). We can calculate the boiling point constant for the solvent.

$k_{b}= \frac{\Delta T}{mi}$

$m=\frac{mol}{kg}$

$k_{b} = \frac{6K}{(\frac{2moles}{1kg})(2)}$

$k_{b} = 1.5\frac{K}{m}$

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Example Question #3 : Colligative Properties

What is the boiling point of a solution composed of three liters of water and 50 grams of sodium chloride?

$K_{b_{H_2O}}=0.515\frac{^{\circ}C}{m}$

$\rho_{H_2O}=1\frac{g}{mL}$

The molar mass of sodium chloride is $58.45\frac{g}{mol}$ .

Possible Answers:

$117.17^{\circ}C$

$100.15^{\circ}C$

$100.29^{\circ}C$

$100.77^{\circ}C$

Correct answer:

$100.29^{\circ}C$

Explanation:

We can use the boiling point elevation equation in order to determine the new boiling point once the salt has been added:

$\Delta T = K_{b}mi$

Since sodium chloride will form two ions for each molecule in solution, the value for the van't Hoff factor will be 2. In addition, the mass of the water in the solution will be 3 kilograms, which can be determined by using the density of water.

$\Delta T = (0.515\frac{^{\circ}C}{m})(\frac{\frac{50g}{58.45\frac{g}{mol}}}{3 kg})(2)$

$\Delta T = 0.29^{\circ}C$

Since water boils at 100 degrees Celsius, this means that the final boiling point of the solution is 100.29 degrees Celsius.

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GRE Subject Test: Chemistry : Boiling Point

Study concepts, example questions & explanations for GRE Subject Test: Chemistry

All GRE Subject Test: Chemistry Resources

Example Questions

Example Question #1 : Physical Chemistry

Example Question #3 : Colligative Properties

All GRE Subject Test: Chemistry Resources

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