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theory_ph [11/04/2018 11:41]
pieter [pH Theory]
theory_ph [11/04/2018 11:43]
pieter [Measurement]
Line 42: Line 42:
  
 ====Measurement==== ====Measurement====
 +<WRAP center round box 60%>
 {{:pictures/ph_junction1.jpg?300|}}\\ {{:pictures/ph_junction1.jpg?300|}}\\
  
-Solution-1sample to be measured\\ +**Solution-1** sample to be measured\\ 
-Solution-2 known buffer solution (7 pH)\\ +**Solution-2** known buffer solution (7 pH)\\ 
-Reference-1silver wire in a salt-bridge (KCI)\\ +\\ 
-Reference-2silver wire in a salt-bridge (KCI)\\+**Reference-1** silver wire in a salt-bridge (KCI)\\ 
 +**Reference-2** silver wire in a salt-bridge (KCI)\\
  \\  \\
 +</WRAP>
 +
 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<sup>+</sup> ions diffuse in the layer. By measuring the generated electrical potential (E) in the layer the corresponding pH can be computed.\\ 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<sup>+</sup> ions diffuse in the layer. By measuring the generated electrical potential (E) in the layer the corresponding pH can be computed.\\
 \\ \\
theory_ph.txt · Last modified: 11/04/2018 11:44 by pieter