The hypothetical weak acid H2A ionizes as shown below. Calculate the [HA-] in 0.20M H2A. H2A ↔ H+ + HA-          Ka1  = 1.0  x  10-7 HA-↔ H+ + A2-             Ka2  = 5.0  x  10-11   a 6.3 x  10-5 M   b 1.0 x  10-7 M    c 3.0 x  10-4M   d 2.2 x 10-6M   e 1.4  x  10-4M

Introductory Chemistry: A Foundation
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Chapter16: Acids And Bases
Section: Chapter Questions
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3. The hypothetical weak acid H2A ionizes as shown below. Calculate the [HA-] in 0.20M H2A.

H2A ↔ H+ HA-          Ka1  = 1.0  x  10-7

HA-↔ H+ A2-             Ka = 5.0  x  10-11

  a

6.3 x  10-5 M

  b

1.0 x  10-7 

  c

3.0 x  10-4M

  d

2.2 x 10-6M

  e

1.4  x  10-4M

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