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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

In each pair of ionic compounds, which is more likely to have the more negative enthalpy of hydration? Briefly explain your reasoning in each case.

  1. (a) LiCl or CsCl
  2. (b) NaNO3 or Mg(NO3)2
  3. (c) RbCl or NiCl2

(a)

Interpretation Introduction

Interpretation: From the following, which pairs have more negative hydration energy has to be identified.

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

The size of Li+ is smaller comparing to Cs+ ion and thus water molecules can easily approach the ion

(b)

Interpretation Introduction

Interpretation: From the following, which pairs have more negative hydration energy has to be identified.

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.

(c)

Interpretation Introduction

Interpretation: From the following, which pairs have more negative hydration energy has to be identified.

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.

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