2PHA206 Chemistry for Pharmacy (II) - James Smith

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Electrodes

Reference electrodes

Standard hydrogen electrode, SHE – see Lecture 2.

• Often not practicable.

Therefore use: Insoluble salt electrodes

• Calomel reference electrode (saturated calomel electrode,

SCE)

• Ag/AgCl reference electrode

Redox electrodes

Ion-selective electrodes

The combination pH electrode

Advantages of Convergent Synthesis - James Smith

Curriculum Vitae - James Smith - University of Portsmouth

Electrodes Reference electrodes Standard hydrogen electrode, SHE – see Lecture 2. • Often not practicable. Therefore use: Insoluble salt electrodes • Calomel reference electrode (saturated calomel electrode, SCE) • Ag/AgCl reference electrode Redox electrodes Ion-selective electrodes The combination pH electrode

Saturated calomel electrode, SCE Very common reference electrode Hg(l) | Hg 2 Cl 2 (s) | Cl - (aq) Reduction half reaction: Hg 2 Cl 2 (s) + 2e - 2Hg(l) + 2Cl - (aq) Pt wire Mercury Mercury – calomel paste Plug (glass wool) Potassium chloride solution, KCl; usually saturated Calomel is mercury(I) chloride, Hg 2 Cl 2 Ceramic or quartz fibre junction

Page 1: 2PHA106 Lecture 4: Electrodes and B
Page 5 and 6: Redox electrodes Redox electrode
Page 7 and 8: The combination pH electrode Based
Page 9 and 10: The biological standard potential,
Page 11: Concentration cells Pt, H 2 | HCl(

2PHA206 Chemistry for Pharmacy (II) - James Smith

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