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theory_ph [11/04/2018 11:41] pieter [Nernst Equation] |
theory_ph [11/04/2018 11:44] pieter [pH Theory] |
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- | <WRAP center round box 60%> | + | <WRAP center round box 40%> |
**pH = -log [H< | **pH = -log [H< | ||
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====Measurement==== | ====Measurement==== | ||
+ | <WRAP center round box 60%> | ||
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- | Solution-1: sample to be measured\\ | + | **Solution-1** sample to be measured\\ |
- | Solution-2 | + | **Solution-2** known buffer solution (7 pH)\\ |
- | Reference-1: silver wire in a salt-bridge (KCI)\\ | + | \\ |
- | Reference-2: silver wire in a salt-bridge (KCI)\\ | + | **Reference-1** silver wire in a salt-bridge (KCI)\\ |
+ | **Reference-2** silver wire in a salt-bridge (KCI)\\ | ||
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+ | </ | ||
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The heart of a pH measurement system is a membrane made from special pH-selective glass on which a very thin layer of hydrogen ions is formed when dipped in water. At high pH values, this layer will have a low hydrogen concentration. However, at low pH values a large number of H< | The heart of a pH measurement system is a membrane made from special pH-selective glass on which a very thin layer of hydrogen ions is formed when dipped in water. At high pH values, this layer will have a low hydrogen concentration. However, at low pH values a large number of H< | ||
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