I have noticed that in some newly published textbooks the Ka2 for H2S is
10^-19 whereas in some books it is 10^-15.  What happened?  New
thermodynamic data?  This certainly changes the treatment of sulfide
ppt.  Any references or ideas?

Claudia Hein
Diablo Valley College
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|  Scott J. Hein        | Diablo Analytical, Inc.   |
|  <sjh…@netcom.com>  | Concord, California, USA  |
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