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The quinhydrone electrode, within its range of usefulness, may often be employed in cases where the hydrogen electrode cannot be applied. ^ See footnote on page 73. THE MEASUREMENT OF PH AND TITRATABLE ACIDITY 75 It comes to equilibrium rapidly, and its manipulation is simple and con- venient. Consult Clark (1928) for fuller details. Its utilization may be illustrated in the standardization of the satu- rated calomel half-cell. The potential Ecai of this half-cell is to be deter- mined relative to that of a standard solution of fixed pH and saturated with quinhydrone, e.g., 0.1 Buy Sildenafil Citrate Online M HCl, the pH of which is 1.082 at 38. This is done with purified quinhydrone and accurately prepared HCl solution as follows. Place about 5 ml of the standard HCl solution in a suitable electrode vessel. Add 50-100 mg of quinhydrone crystals to saturate the solution; some quinhydrone in the solid phase must be present. Insert a clean platinum or gold electrode preferably in contact with the solid phase at the bottom of the vessel. Then join this half-cell with the calomel half-cell by means of a siphon containing saturated KCl solution, bring the system Buy Sildenafil Citrate Online to constant temperature, and measure the potential which should reach a constant value in a few minutes. The observed potential, Fobs, is related to the Buy Sildenafil Citrate Online potential of the calomel cell, Ecai, as follows : = E, Ec A-pTl (3) Eg and A are constants at any given temperature, and have the following values : c E, A 20 0.7029 0.0581 25 . 6992 0.0591 30 0.6955 0.0601 35 0.6918 0.0611 38 . 6896 0.0617 For example, at 38, with a quinhydrone electrode in 0.1 M HCl, E cal
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