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solutions1 - Bio 20A-M. Dalbey Solutions to Supplementary...

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Bio 20A-M. Dalbey Solutions to Supplementary Problems for WATER Lecture 3/29/08 1 of 2 Solutions to Supplementary Problems for Water Lecture 1. The lowest pH value ever reported in a water sample from nature is pH = -3.6 (Yes, that is negative 3.6). This value was reported in a study of water draining from an abandoned mine in Northern California (Iron Mountain), and represents a serious environmental problem for the watershed downstream. Iron Mountain is an EPA Superfund site. What is the molar concentration of H + at pH = -3.6? pH = -log[H+] = -log -3.6 [H + ] = 3981 M Where the heck could all those protons be coming from? The acidity is due to the biochemical activities of bacteria that derive their energy from the oxidation of the iron ore FeS 2 (pyrite) in tghe mine tailings. FeS 2 + 8 H 2 0 ---> Fe + 3 + 2 SO 4 = + 16 H + The sulfuric acid produced by the bacteria is further concentrated by evaporation to produce the very low pH runoff. REFERENCES
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This note was uploaded on 09/15/2011 for the course BIO 20a taught by Professor Dalby during the Spring '08 term at UCSC.

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solutions1 - Bio 20A-M. Dalbey Solutions to Supplementary...

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