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The following other wikis use this file: Usage on bg.wikipedia.org Водороден показател; Usage on en.wikibooks.org Principles of Biochemistry/Water: The solvent of the cell
This image is a derivative work of the following images:jbhoikjbi File:PHscalenolang.png licensed with Cc-by-sa-2.5, Cc-by-sa-2.5 . 2007-01-23T22:52:18Z PatríciaR 731x205 (14953 Bytes) {{Information |Description=A simple pH (and pOH) scale, for multi-language use. |Source=own work |Date=23rd January 2007 |Author=myself, PatríciaR |Permission= |other_versions=[[:Image:EscalapH.png]], in ...
English: I retrieved the soil pH maps from . In GIMP 2.4.3 I used the "Select by Color Tool" (threshold 15.0) to create pH-specific maps. Note that the original maps do not indicate actual pH values in the pH scale. For soils with acidic pH, I included the colors indicated by the leftmost 14 bars in the pH scale, ranging from red to pink.
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pH values can be measured in non-aqueous solutions, but they are based on a different scale from aqueous pH values because the standard states used for calculating hydrogen ion concentrations are different. The hydrogen ion activity, a H +, is defined [21] [22] as:
In and of themselves, pH indicators are usually weak acids or weak bases. The general reaction scheme of acidic pH indicators in aqueous solutions can be formulated as: HInd (aq) + H 2 O (l) ⇌ H 3 O + (aq) + Ind − (aq) where, "HInd" is the acidic form and "Ind −" is the conjugate base of the indicator. Vice versa for basic pH indicators ...
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