...B. GENERAL TESTS Water Determination (Karl Fischer Method) The Water Determination Test (Karl Fischer Method) is designed to determine water content in substances, utilizing the quantitative reaction of water with iodine and sulfur dioxide in the presence of a lower alcohol such as methanol and an organic base such as pyridine, as shown in the following formulae: H2O+I2+SO2 + 3 C5H5N C5H5N SO3 + CH3OH 2(C5H5N+H)I- + C5H5N SO3 (C5H5N+H)O-SO2 OCH3. There are two determination methods different in iodine-providing principle: the volumetric titration method and the coulometric titration method. In the volumetric titration method, iodine required for reaction with water is previously dissolved in water determination TS, and water content is determined by measuring the amount of iodine consumed as a result of reaction with water in a sample. In the coulometric titration method, first, iodine is produced by electrolysis of the reagent containing iodide ion, and then, the water content in a sample is determined by measuring the quantity of electricity which is required for the electrolysis (i.e., for the production of iodine), based on the quantitative reaction of the generated iodine with water. Hereinafter in the Monographs, such a specification back titration) not more than 4.0% (0.5 g, indicates that when determined by weighing about 0.5 g of the sample accurately and performing back titration, the water content is not more than 4.0% of the weight of the sample. Method Volumetric...
Words: 1315 - Pages: 6
...SPECIFICATIONS MICROPROCESSOR: Microprocessor Clock Frequency: Effective Cycle Frequency: (Including Ref r e sh Waits) MOS TECHNOLOGY 6502 1.023 MHz 0.960 MHz VIDEO OUTPUT: Composite positive video, 75 ohms, l e v e l adjustable between z e r o a n d -15Vpp. Line Rate: F r a m e Rate: Format: 40 c h a r a c t e r s / l i n e , 24 lines; with automatic scrolling Dynamic shift r e g i s t e r s (1K x 7) Display Memory: C h a r a c t e r Matrix: RAM MEMORY: On-board RAM Capacity: 16-pin, 4K Dynamic, type 4096 (2104) 8K bytes (4K supplied) POWER S U P P L E S : +5 Volts @ 3 amps, +/- 1 2 Volts @0.5 amp and -5 Volts @ 0.5 a m p s 1A. Input Power Requirements: 8 t o 10 Volts AC (RMS) @ 3 a m p s , 26 t o 28 Volts AC (RMS) Center-Tapped, Stancor # P-8380 o r T r i a d F31-X Stancor # P-8667 o r T r i a d F40-X Recommended T r a n s f o r m e r s : A P P L E COMPUTER COMPANY 770 Welch Road, Suite 154 P a l o Alto, California 94304 Phone: (415) 326-4248 The Apple Computer i s a complete micro'~,ocessor system, consisting of a Mos Technology 2 m i c r o p r o c e s s o r and support hardware, inJral video display electronics, dynamic m e m o r y and r e f r e s h hardware, and fully regulated power supplies. It contains resident s y s t e m monitor software, enabling the u s e r , via the keyboard and display, t o write, examine, debug, and run p r o g r a m s efficiently; thus being a n educational tool f o r...
Words: 4837 - Pages: 20