Manual of Quantitative Chemical Analysis; For the Second Year of College Work

 
9781234212100: Manual of Quantitative Chemical Analysis; For the Second Year of College Work
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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1914 edition. Excerpt: ...be suificient for the combustion. A small mufile furnace is very convenient for burning the "ash." If ash is to be determined in a new sample, heat very slowly at first so that the coal will not coke while the_volatile matter is being expelled. Then when the heat is increased the sample remains in a powdered condition and rapidly burns. This saving in time is not enough, however, to-compensate for the extra trouble in weighing out a new sample if the coke from the volatile matter is available. The loss in weight is the fixed carbon, while the residue is the ash. Calorific Value of Coal by Means of the Pan-Calorimeter. Weigh.5 gram of the dry powdered coal into the bomb of the calorimeter. Pour on top of this, one gram of the accelerator and one measure of sodium peroxide. Fit the false cap on firmly and shake thoroughly. Take off the false cap and put on the regular cap with the stem and ignition device= See that the loop of wire does not touch the sides of the bomb, and turn all joints until perfectly tight. Fit on the stirring blades and place in side the metal cup, being careful all the time to keep the bomb in a vertical position. Pour into the metal cup exactly 2000 c. c. of distilled water. Put on cover, fit on wheel and connect it with the motor by means of the belt. Insert the thermometer and start the motor. After three minutes make a note of the thermometer reading, and repeat every minute until the reading is constant. Fire the bomb by closing the contact on the lid. As soon as the mercury in the thermometer starts to rise rapidly, release the contact and begin to note the thermometer-readings again, taking one reading every minute until the temperature becomes constant. Note the total rise in temperature. NOTE: If...

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