CHEMISTRY-MASTERINGCHEMISTRY W/ETEXT
CHEMISTRY-MASTERINGCHEMISTRY W/ETEXT
8th Edition
ISBN: 9780135204634
Author: Robinson
Publisher: PEARSON
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Chapter 13, Problem 13.1P
Interpretation Introduction

Interpretation:

The given compounds should be arranged in order of increasing solubility in pentane.

Concept introduction:

Polarity of any substance is measuring as dipole moment and solubility of any substance depends on the type of bonds present in it like polar and non-polar. According to the rule, like dissolve like, polar solute dissolve in polar solvent and non-polar solute dissolve in non-polar solvents.

Expert Solution & Answer
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Answer to Problem 13.1P

Solution:The order of increasing solubility in pentane is as follows:

KBr< 1,5pentanediol < toluene

Explanation of Solution

Polar organic compounds with less than six carbon atoms, low molecular weight, are soluble in both organic solvents and water.

Polar organic compounds with more than six carbon atoms, higher molecular weight, are soluble in organic solvents but insoluble in water.

There are following factors on which the solubility of solute in solvent depends:

    Solute Solvent
    Polar Non-polar
    Ionic Soluble Insoluble
    Polar Soluble Insoluble
    Non-PolarInsoluble Soluble

Polar molecules: A polar molecule is known as dipole means with two poles positive and negative. The attraction force between positive pole of one molecule with negative pole of another molecule is called dipole force.

Non-polar: A non-polar molecule is a type of molecules where the electrons are distributed more proportionally and there is no charge at the opposite sides. The charges all cancel out each other. For examples hydrocarbon like benzene, toluene etc.

Toluene: Toluene, it is non-polar compound thus it is maximum soluble in non-polar solvent; pentane.

  1,5

pentanediol: Due to the presence of hydroxyl group, it is slightly polar thus it is less soluble in non-polar solvent; pentane.

KBr: KBris a polar compound, which is present as ions; K+, Brand insoluble in non-polar solvent; pentane.

Conclusion

Therefore, the order of increasing solubility in pentane is as follows:

KBr< 1,5pentanediol < toluene

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Chapter 13 Solutions

CHEMISTRY-MASTERINGCHEMISTRY W/ETEXT

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