A lab experiment for osmosis with potatoes involves putting half a potato in plain water and the other half in salt water and observing the difference in appearance. Osmosis is defined as the manner in which molecules pass through a membrane into a more concentrated solution.Continue Reading
Only a few supplies are required for this experiment. Gather a large potato, knife, two plastic plates, salt and water.
The potato that was in plain water will not look much different than before, except it may be a bit more rigid. That is because the plain water moved into the potato's cells. The potato in the salt water will be slightly discolored, soft and flexible. This is because the contents of the potato's cells moved out of the potato and into the salt water by osmosis.Learn more about Chem Lab
The independent variable for the Drops on a Penny lab experiment is the type of solution used for the experiment. The independent variable is the portion of the experiment that is changed between tests.Full Answer >
Perform an acid-base titration in the lab by setting up a burette, dissolving the material for analysis in water in a flask, adding an indicator, recording an initial reading of the burette, adding titrant until the color changes and taking the final reading. The experiment usually takes less than an hour.Full Answer >
Steve Spangler's elephant toothpaste experiment demonstrates how potassium iodide can be used to catalyze hydrogen peroxide, creating water and oxygen. Food coloring and soap are added as visual aids. When the two liquids are mixed, the potassium ion reacts with the peroxide, liberating large amounts of oxygen. The soap traps this oxygen as bubbles, which boil out of the vessel like toothpaste squeezed energetically from a tube.Full Answer >
Designed to demonstrate cellular respiration, this experiment shows that germinating pea plants consume more oxygen than nongerminating plants and that peas germinating in warm water consume more oxygen than those in cold water.Full Answer >