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Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

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BuyFindarrow_forward

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

Which of the following ionic compounds will have the most negative enthalpy of hydration?

  1. (a) Fe(NO3)2
  2. (b) CoCl2
  3. (c) NaCl
  4. (d) Al(NO3)3

Interpretation Introduction

Interpretation: Ionic compounds having the most negative enthalpy of hydration has to be identified from the given options.

Concept Introduction:

Enthalpy of hydration is the enthalpy of solvation of ions.

The value of enthalpy of hydration depends on

  • Charge of the ion
  • Distance between the center of ion and the oppositely charged end of the water dipole.
Explanation

Reason for correct option

The charge of Al is +3 and Na is +1 whereas the charge of Fe and Co +2

The size of Al3+ is the smallest. Hence Al3+ ion can strongly interact with the water molecule

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