Explanation H 2 A is a polyprotic acid. It is strong acid in its first deprotonation. Therefore, to estimate its p H , the second deprotonation needs to be taken in account. The first and second deprotonation reactions are given below. H 2 A ( a q ) + H 2 O ( l ) → H 3 O + ( a q ) + H A − ( a q ) H A − ( a q ) + H 2 O ( l ) ⇌ H 3 O + ( a q ) + A 2 − ( a q ) , K a 2 The expression for equilibrium constant for the above reaction can be written as shown below, K a 2 = [ H 3 O + ] [ A 2 − ] [ H A − ] The conjugate base H A − is amphiprotic and it contributes protons to the solution which has been shown in the second deprotonation reaction above. An equilibrium table can be set up as given below. C o m p o s i t i o n ( M ) H A − H 2 O H 3 O + A 2 − I n i t i a l c o n c e n t r a t i o n 0.015 − 0.015 0 C h a n g e i n c o n c e n t r a t i o n − x − + x + x E q u i l i b r i u m c o n c e n t r a t i o n 0.015 − x − 0.015 + x x Now, these values in the fourth row can be inserted in the equilibrium constant expression as shown below

Chemical Principles: The Quest for Insight

7th Edition

ISBN: 9781464183959

Author: Peter Atkins, Loretta Jones, Leroy Laverman

Publisher: W. H. Freeman

See similar textbooks

Concept explainers

Electrolysis

Electrolysis is defined as the process of breaking down ionic compounds into their constituent elements by passing a direct electric current through the compound in a fluid state. The cathode reduces cations, while the anode oxidizes anions. An electroly…

Videos

Question

Chapter 6, Problem 6E.8E

Interpretation Introduction

Interpretation:

The value of Ka2 for the acid H2A has to be calculated.

Expert Solution & Answer

Want to see the full answer?

Check out a sample textbook solution

See solution

Chapter 6, Problem 6E.7E

Chapter 6, Problem 6E.9E

Students have asked these similar questions

Lab Data The distance entered is out of the expected range. Check your calculations and conversion factors. Verify your distance. Will the gas cloud be closer to the cotton ball with HCI or NH3? Did you report your data to the correct number of significant figures? - X Experimental Set-up HCI-NH3 NH3-HCI Longer Tube Time elapsed (min) 5 (exact) 5 (exact) Distance between cotton balls (cm) 24.30 24.40 Distance to cloud (cm) 9.70 14.16 Distance traveled by HCI (cm) 9.70 9.80 Distance traveled by NH3 (cm) 14.60 14.50 Diffusion rate of HCI (cm/hr) 116 118 Diffusion rate of NH3 (cm/hr) 175.2 175.2 How to measure distance and calculate rate

For the titration of a divalent metal ion (M2+) with EDTA, the stoichiometry of the reaction is typically: 1:1 (one mole of EDTA per mole of metal ion) 2:1 (two moles of EDTA per mole of metal ion) 1:2 (one mole of EDTA per two moles of metal ion) None of the above

Please help me solve this reaction.

Chapter 6 Solutions

Chemical Principles: The Quest for Insight

Ch. 6 - Prob. 6A.1AST Ch. 6 - Prob. 6A.1BST Ch. 6 - Prob. 6A.2AST Ch. 6 - Prob. 6A.2BST Ch. 6 - Prob. 6A.3AST Ch. 6 - Prob. 6A.3BST Ch. 6 - Prob. 6A.1E Ch. 6 - Prob. 6A.2E Ch. 6 - Prob. 6A.3E Ch. 6 - Prob. 6A.4E

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, chemistry and related others by exploring similar questions and additional content below.