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New Tab d www.saplinglearning.com/ibiscms/mod/ibis/view.php?id=4589194 C Q Sapling Learning macmilan learming ::: Apps Scholarship Award fc Scholarship Opportu \"Hit the Books\" Scho 6 3100 Due Date: Points Possible: Grade Category: 2/26/2018 11:59 PM 100 Quiz 3 Sapling Learning For the diprotic weak acid H2, Ka 2.1 10 and K 6.8 x10 What is the pH of a 0.0800 M solution of H2A7 What are the equilibrium concentrations of H2A and A2 in this solution? Policies: Quiz 10 You can check your answers. You can view solutions after the due date. You have three attempts per question There is no penalty for incorrect answers. 12 1 13 1 eTextbook 14 Help With This Topic 15 1 16 2 Web Help& videos D Technical Support and Bug Reports 18 2 19 0 20 1 Previous Check Answer Next Exit Hint 2011-2018 Sapling Learning, Inc about uscrsprivacy policy erms of usecotus help O Type here to search 10:09 PM 2/26/2018

Solution

H2A   ------------->   HA-   +    H+

0.0600                     0            0

0.060 - x                  x              x

Ka1 = x^2 / 0.060 - x

2.1 x 10^-8 = x^2 / 0.060 - x

x = 3.55 x 10^-5

[H+] = 3.55 x 10^-5 M

pH = -log [H+] = -log (3.55 x 10^-5 )

pH = 4.45

[H2A] = 0.0600 M

[A2-] = 6.8 x 10^-9 M