High-Frequency Titration: Theoretical and Practical Aspects

Analysis of Variation of Coil Character by Aqueous Solution with Q-Meter

“…5, one obtains (15) (16) Taking it into account that the dielectric constant of aqueous solution does not change greatly with concentration, since it has been shown in Refs. 30 and 33, one differentiates the function with respect to x and puts the differential coefficient equal to zero, so that the following conditions, which give the minimum and the maximum points of Q/Q1 curve, are obtained: (17) where positive and negative signs show minimum and maximum, respectively. On the other hand, the specific resistance, r.…”

The use of a radio-frequency oscillator in student analysis

“…The present apparatus perforins equally well at 2.0 and 5.0 megacycles and almost as well at 10.7 megacycles. The values of Ri, i£2, and Rs may need to be adjusted slightly 'to secure total closing of the eye at the frequency chosen, and to secure the desired range of voltmeter re- Ri 15,000 ohms, 1 watt Ri 4700 ohms, 1 watt Ri 2000 ohms, 1 watt Ri 1 megohm, V* watt Rs 5000 ohms, 10 watt Rs 15,000 ohms, 20 watt Ri 100,000 ohms, 1 watt Es 10,000 ohms, ww. potentiometer spouse.…”

“…(ci) High-frequency Cell, (b) Equivalent Circuit of Highfrequency Cell is their use of reaction vessels or cells which are made of glass or some other insulating material without electrodes in direct contact with the solution. Recently it has been shown that the radio-frequency response of 1 Presented before the Division of Chemical Education at the 124th Meeting of the American Chemical Society, Chicago, September, 1953. Figure 2.…”

Mechanism of High-Frequency Titration

“…Recently several studies ( I , 6,18) have gone far toward explaining the results of high-frequency titrations on a sound theoretical basis. These studies were all based upon apparatus in which the solutions studied were placed in capacitor-type cells.…”