(a) 0.49 M cyanic acid (HCNO, PK₂ = 3.46) 0.02 X % The approximation is valid. O The approximation is not valid. (b) 0.0014 M hydrazoic acid (HN3, PK₂ = 4.6) % O The approximation is valid. The approximation is not valid. (c) 5.7 M arsenic acid (H3ASO4, PK₂ = 2.26) % The approximation is valid. O The approximation is not valid.

Chemistry & Chemical Reactivity
9th Edition
ISBN:9781133949640
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter16: Principles Of Chemical Reactivity: The Chemistry Of Acids And Bases
Section: Chapter Questions
Problem 106GQ: The hydrogen phthalate ion, C8HsO4, is a weak acid with Ka = 3.91 106....
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Use the 5% rule to determine whether or not the equilibrium concentration of the acid can be approximated by its makeup concentration.
(a) 0.49 M cyanic acid (HCNO, PKa = 3.46)
0.02
* %
O The approximation is valid.
O The approximation is not valid.
(b) 0.0014 M hydrazoic acid (HN3, PK₂ = 4.6)
%
O The approximation is valid.
O The approximation is not valid.
(c) 5.7 M arsenic acid (H3ASO4, Pka = 2.26)
%
O The approximation is valid.
O The approximation is not valid.
Transcribed Image Text:Use the 5% rule to determine whether or not the equilibrium concentration of the acid can be approximated by its makeup concentration. (a) 0.49 M cyanic acid (HCNO, PKa = 3.46) 0.02 * % O The approximation is valid. O The approximation is not valid. (b) 0.0014 M hydrazoic acid (HN3, PK₂ = 4.6) % O The approximation is valid. O The approximation is not valid. (c) 5.7 M arsenic acid (H3ASO4, Pka = 2.26) % O The approximation is valid. O The approximation is not valid.
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