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Cold water extraction: Difference between revisions
>David Hedlund Heat, such as a heating mat, often evaporates a portion of the substance. |
>David Hedlund →Procedures: # Weight the substance again, and compare it with the weight in step 1. |
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==Procedures== | ==Procedures== | ||
# Weight the substance, and write down the value. | |||
# For lumped substances: Break them apart. | # For lumped substances: Break them apart. | ||
# Sift the powder with a coarse strainer, and then with a fine strainer, to make them easy to dissolve. | # Sift the powder with a coarse strainer, and then with a fine strainer, to make them easy to dissolve. | ||
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# Put the clear phase in a glass baking dish and let evaporate. Use several glass baking dishes to get more surface for quicker evaporation. Heat, such as a heating mat, often evaporates a portion of the substance. | # Put the clear phase in a glass baking dish and let evaporate. Use several glass baking dishes to get more surface for quicker evaporation. Heat, such as a heating mat, often evaporates a portion of the substance. | ||
# The substance will stick to glass surface when dissolved with water, so use a baking scraper, and finish scraping the residues with a razor blade. | # The substance will stick to glass surface when dissolved with water, so use a baking scraper, and finish scraping the residues with a razor blade. | ||
# Weight the substance again, and compare it with the weight in step 1. | |||
# Repeat the steps with the sediment to precipitate the 10% water-soluble substances. | # Repeat the steps with the sediment to precipitate the 10% water-soluble substances. | ||
[[Category:Preparation]] | [[Category:Preparation]] | ||