A Laboratory Outline of Smiths Intermediate Chemistry

Cover A Laboratory Outline of Smiths Intermediate Chemistry
A Laboratory Outline of Smiths Intermediate Chemistry
Smith Alexander
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1 and No. 2. * Starch. Hydro- chloric acid (cone. ). Potassium iodide (sol. ). Iodine. Sodium carbonate (sol. ). Litmus papers. Sugar. Molasses.
a. Starch and Glucose. Shake about 0. 5 c. C. Of starch with 20 c. C. Of water and then boil (?). Add a few drops of the liquid to 5 c. C. Of Fehling's solution and warm the latter (?). Does starch change Fehling's solution?
Place three-fourths of the remaining starch suspension in a flask, set it on the wire gauze, add 5 or 6 drops of concentrated hyd
...rochloric acid, and boil gently for ten minutes. Place the funnel in the mouth of the flask, to diminish the loss by evapora- tion, and add a little water when necessary so as to keep the volume constant.
b. While this is going on, cool the rest of the starch sus- pension in running water and pour it into a beaker full of cold water. Add one drop from 5 c. C. Of a solution of potassium iodide in which a single crystal of iodine has been dissolved (?).
e. Cool the contents of the flask (from a) and add sodium * No.


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