This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1909 Excerpt: ...Heats of formation are measured in a calorimeter similar to that described in 53 unless gases are among the initial or final products, in which case a calorimeter of the bomb type ( 55) is used. Heats of solution and dilution are usually measured in a calorimeter of the first type. EXPERIMENT XXI. Heat of Solution. A ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1909 Excerpt: ...Heats of formation are measured in a calorimeter similar to that described in 53 unless gases are among the initial or final products, in which case a calorimeter of the bomb type ( 55) is used. Heats of solution and dilution are usually measured in a calorimeter of the first type. EXPERIMENT XXI. Heat of Solution. A calorimeter is set up as described in 53. A measured amount of water or other solvent is poured into the inner calorimeter. The substance to be dissolved2 is carefully weighed and placed 1 Nernst, "Thermodynamics and Chemistry," p. 36. 'Any of the common salts, acids or bases are suitable. Sodium sulphate is a particularly interesting example of LeChatelier's principle. The heat of solution of the hydrate should be determined at about room temperature and that of the anhydrous salt in water, at about 400. If one of the organic acids suggested in Experiment XL is used, th: results of the two experiments can be compared. in a thin-walled test-tube. The latter is supported in the solvent by the cardboard cover. When the solvent has been stirred for some time and the temperature as read by a sensitive thermometer is approximately constant, readings are made of the temperature every minute for five minutes and then the bottom of the test-tube is broken by a glass rod. The liquid is continually stirred and the temperature is read every minute until five minutes after a maximum, minimum, or approximately constant temperature is attained. The inner calorimeter, stirrer and test-tube are weighed and their water equivalents, together with that of the thermometer, are calculated ( 54). The temperature observations are plotted against the time and the radiation correction is calculated ( 59). Let m =mass of dissolved s...
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