Elevation in Boiling Point of the Solvent

IMPORTANT

Elevation in Boiling Point of the Solvent: Overview

This topic covers concepts, such as, Elevation of Boiling Point, Molal Boiling Point Elevation Constant, Molecular Mass of a Solute through Elevation of Boiling Point & Molal Boiling Point Elevation Constant Using Molar Heat of Vapourisation etc.

Important Questions on Elevation in Boiling Point of the Solvent

MEDIUM
IMPORTANT

A solution containing 8 g of a substance in 100 g of diethyl ether boils at 36.86°C,  whereas, pure ether boils at 35.60°C.

The molecular mass of the solute would be: (for etherKb=2.05Kkgmol1)

HARD
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The boiling point elevation of 0.30 g acetic acid in 100 g benzene is 0.0633 K. From this data, find the molar mass of acetic acid. (For benzene, Kb=2.53 K ​kg mol-1)

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Molal elevation constant is the elevation in boiling point produced by

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The boiling point (in C) of 0.1 molal aqueous solution of CuSO4.5H2O at 1 bar is closest to: [Given: Ebullioscopic (molal boiling point elevation) constant of water, Kb=0.512 K kgmol-1

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The molal elevation constant for water is 0.52. What will be the boiling point of 2 molar sucrose solution at 1 atm pressure? (Assume that the boiling point of pure water is 100 )

MEDIUM
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Which of the following are correct for the elevation of boiling point (Tb):

HARD
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The boiling point of benzene is 353.23K. When 1.80 g of a non-volatile, non-ionisable solute was dissolved in 90g of benzene, the boiling point raised to 354.11 K. Calculate molar mass of the solute in gmol-1Kb for benzene= 2.53 K kg mol-1)

(Report your answer upto 1 decimal value)

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The boiling point of 0.001 M aqueous solutions of NaCl, Na2SO4, K3PO4 and CH3COOH should follows the order.

MEDIUM
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Latent heat of vaporization for a liquid solvent is 500 cal g-1. Let the boiling point be Tb K. Find the value of Kb of the solvent in K kg mol-1

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A protein has been isolated as sodium salt with their molecular formula NaxP (this notation means that xNa+ ions are associated with a negatively charged protein P-x). A solution of this salt was prepared by dissolving 0.25g of this sodium salt of protein in 10g of water and ebullioscopic analysis revealed that solution boils at temperature 6.78 x 10-3 oC higher than the normal boiling point of pure water. Kb of water is 0.52 k kg mol-1. Also elemental analysis revealed that the salt contain 1% sodium metal by weight.

Determine molecular weight of acidic form of protein :

HARD
IMPORTANT

For next two question please follow the same

A protein has been isolated as sodium salt with their molecular formula NaxP (this notation means that xNa+ ions are associated with a negatively charged protein P-x). A solution of this salt was prepared by dissolving 0.25g of this sodium salt of protein in 10g of water and ebullioscopic analysis revealed that solution boils at temperature 6.78 x 10-3 oC higher than the normal boiling point of pure water. Kb of water is 0.52 k kg mol-1. Also elemental analysis revealed that the salt contain 1% sodium metal by weight.

Determine molecular weight of sodium salt of protein.

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The molal elevation constant is the ratio of the elevation in boiling point to:

MEDIUM
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Which of the following aqueous solutions should have the highest boiling point?

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The unit of an ebullioscopic constant is ______.

MEDIUM
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Boiling point of a solvent is 80.2°C. When 0.419 g of the solute of molar mass 252.4 g mol-1 was dissolved in 75 g of the solvent, the boiling point of the solution was found to be 80.256°C. Find the molal elevation constant.

MEDIUM
IMPORTANT

Calculate the mass in grams of an impurity of molar mass 100 g mol-1 which would be required to raise the boiling point of 50 g of chloroform by 0.30 K(Kb for chloroform = 3.63 K kg mol-1)

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If mass is expressed in gram then Kb is given by.

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The determination of molar mass from elevation in boiling point is called as

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When NaCl is added to water.

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What is elevation of boiling point?