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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

Equal molar quantities of sodium hydroxide and sodium hydrogen phosphate (Na2HPO4) are mixed.

  1. (a) Write the balanced, net ionic equation for the acid-base reaction that can, in principle, occur.
  2. (b) Does the equilibrium lie to the right or left?

(a)

Interpretation Introduction

Interpretation: The balanced, net ionic equation is to be written for the mixture of NaOH and Na2HPO4.

Concept introduction:

Balanced reaction is a chemical reaction in which number of atoms for each element in the reaction and the total charge are same on both reactant side and the product side.

Steps in balancing the information

  • Step 1: Write the unbalanced equation
  • Step 2: Find the coefficient to balance the equation.
  • The coefficient should be reduced to the smallest whole number
Explanation

When NaOH and Na2HPO4 are mixed in equal molar concentration.NaOH dissociates completely into its ions OH and Na+ as it is a strong base. The OH will abstract the proton from HPO42 and form water and  PO43.

The net ionic balanced reaction between NaOH and Na2HPO4

(b)

Interpretation Introduction

Interpretation: The direction of the equilibrium for the given reaction is to be determined.

Concept introduction: An acid-base reaction reaction is represented as written below.

  HA(aq)+B(aq)   BH+(aq)  +    A(aq)(acid)    (base)        (conjugate     acid)   (conjugate     base)

The base will take up the proton from acid and form its conjugate acid and simultaneously acid will form its conjugate base. The equilibrium will be forward or backward can be determined by using the dissociation constants (Kaand Kb) for reactants as well as of the products. The more the value of Ka for an acid, stronger will be the acid and it will undergo faster ionization. Similarly, higher the value of Kb for a base, stronger will be the base and it will undergo faster ionization.

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