Search Results Collection Resources (7)

View
Selected filters:
  • Sodium
How to extract Caffeine from Tea (Classic DCM Method)
Conditions of Use:
Read the Fine Print
Rating

Extractions of certain solids can be performed by utilizing the different chemical ...

Extractions of certain solids can be performed by utilizing the different chemical properties of various solvents. The initial solvent used in the extraction of caffeine is water. Caffeine is sparingly soluble in water at ambient temperatures but highly soluble in water at 100oC. The boiling of coffee beans and tea leaves dissolves caffeine and other materials to produce coffee and tea beverages. We will take advantage of the solubility properties of caffeine in water to create an aqueous solution of caffeine at room temperature. First, the caffeine will be dissolved from tea leaves by boiling them in water. The solution will be allowed to cool to room temperature. Although the solubility of caffeine is low at room temperature; the caffeine will remain in solution and must be extracted with another solvent.

Subject:
Physical Science
Material Type:
Activity/Lab
Provider:
اليوتيوب
Author:
NileRed
Date created
8-شعبان-1439
Neon Lights & Other Discharge Lamps
Conditions of Use:
Read the Fine Print
Rating

Produce light by bombarding atoms with electrons. See how the characteristic spectra ...

Produce light by bombarding atoms with electrons. See how the characteristic spectra of different elements are produced, and configure your own element's energy states to produce light of different colors.

Subject:
Physics
Material Type:
Simulation
Provider:
University of Colorado Boulder
Provider Set:
PhET Interactive Simulations
Author:
Carl Wieman
Danielle Harlow
Harlow, Danielle
Kathy Perkins
Lemaster, Ron
McKagan, Sam
Perkins, Kathy
PhET Interactive Simulations
Ron LeMaster
Sam McKagan
Wieman, Carl
Date created
2-ذو القعدة-1432
Titration of Hydrochloric Acid with Sodium Hydroxide
Conditions of Use:
Remix and Share
Rating

Titration of Hydrochloric Acid with Sodium Hydroxide the purpose of this lab ...

Titration of Hydrochloric Acid with Sodium Hydroxide
the purpose of this lab is to determine the concentration of a hydrochoric acid solution using acid-base titration

Subject:
Chemistry
Material Type:
Syllabus
Provider:
Al Jouf University
Author:
Al Jouf University
د. مطر صنت عوض الله المطيري
Date created
29-جمادي الأولى-1440
sodium potassium pump animation
Conditions of Use:
Remix and Share
Rating

The sodium/potassium pump is a good example of active transport of molecules ...

The sodium/potassium pump is a good example of active transport of molecules across a membrane. In this example, active transport is coupled to ATP hydrolysis to obtain enough free energy to transport the ions against their concentration gradient. This ion pump is an example of antiport membrane transport, where the transported molecules are pumped across the membrane in opposite directions (as opposed to synport). The sodium gradient is generated for use by cotransport systems, such as the active transport of glucose from the extracellular environment into the inside of the cell. The non-equilibrium state of the sodium gradient is essentially free energy to be used for the import of molecules against their own concentration gradient.

Subject:
Life Science
Physical Science
Material Type:
Lecture
Provider:
Global institute of medical sciences
Author:
Dr.G.Bhanu Prakash
Date created
9-جمادي الآخرة-1438