Explanation H 2 S O 4 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 S O 4 ( a q ) + H 2 O ( l ) → H 3 O + ( a q ) + H S O 4 − ( a q ) H S O 4 − ( a q ) + H 2 O ( l ) ⇌ H 3 O + ( a q ) + S O 4 2 − ( a q ) , K a 2 = 0.012 The expression for equilibrium constant for the above reaction can be written as shown below, K a 2 = [ H 3 O + ] [ S O 4 2 − ] [ H S O 4 − ] The conjugate base H S O 4 − 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 S O 4 − H 2 O H 3 O + S O 4 2 − I n i t i a l c o n c e n t r a t i o n 0.050 − 0.050 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

Chemical Principles: The Quest for Insight

7th Edition

ISBN: 9781464183959

Author: Peter Atkins, Loretta Jones, Leroy Laverman

Publisher: W. H. Freeman

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Chapter 6, Problem 6E.1AST

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The pH of 0.050 M H2SO4(aq) has to be calculated.

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Chapter 6, Problem 6D.22E

Chapter 6, Problem 6E.1BST

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MISSED THIS? Read Section 19.9 (Pages 878-881); Watch IWE 19.10 Consider the following reaction: CH3OH(g) CO(g) + 2H2(g) (Note that AG,CH3OH(g) = -162.3 kJ/mol and AG,co(g)=-137.2 kJ/mol.) Part A Calculate AG for this reaction at 25 °C under the following conditions: PCH₂OH Pco PH2 0.815 atm = 0.140 atm 0.170 atm Express your answer in kilojoules to three significant figures. Ο ΑΣΦ AG = -150 Submit Previous Answers Request Answer □? kJ × Incorrect; Try Again; 2 attempts remaining Calculate the free energy change under nonstandard conditions (AGrxn) by using the following relationship: AGrxn = AGrxn + RTInQ, AGxn+RTInQ, where AGxn is the standard free energy change, R is the ideal gas constant, T is the temperature in kelvins, a is the reaction quotient. Provide Feedback Next >

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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

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