Interpretation Introduction To determine: The concentration of the different species present in the 0.155 M (molar) of H 2 CO 3 . Explanation Carbonic acid is an example of a weak diprotic acid. The ionization of H 2 CO 3 occurs in two steps, which have been described as follows: H 2 CO 3 ( aq ) + H 2 O ( l ) → H 3 O + ( aq ) + HCO 3 − ( aq ) HCO 3 − ( aq ) + H 2 O ( l ) → H 3 O + ( aq ) + CO 3 2 − ( aq ) Furthermore, the ICE (initial, change, and equilibrium) table can be constructed, in order to determine the value of x , as follows: [ H 2 CO 3 ] [ H 3 O + ] [ HCO 3 − ] Initial 0.155 0 0 Change – x + x + x Equilibrium 0.155– x x x The acid dissociation constant equation can be used to calculate the value of x , wherein K a 1 equals to 4.3 × 10 − 7 . K a 1 = [ H 3 O + ] [ HCO 3 − ] [ H 2 CO 3 ] 4.3 × 10 − 7 = ( x ) × ( x ) 0.155 − x x = 2.58 × 10 − 4 M Similarly, the ICE table for the second ionization reaction can be constructed as follows: [ HCO 3 − ] [ H 3 O + ] [ CO 3 2 − ] Initial 2.58 × 10 − 4 2

3rd Edition

ISBN: 9780321809247

Author: Nivaldo J. Tro

Publisher: Prentice Hall

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Chapter 15, Problem 114E

Interpretation Introduction

To determine: The concentration of the different species present in the 0.155 M (molar) of H2CO3.

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Chapter 15, Problem 113E

Chapter 15, Problem 115E

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Chapter 15 Solutions

Chemistry: A Molecular Approach

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