Uploaded March 2020 | Updated September 2026, 3 weeks ago
How can one see diffusion with the help of iodine?
Equipment: releasable bag, copper(II) sulfate, potassium iodide solution, starch solution.
Mix copper(II) sulfate and a solution of potassium iodide in a releasable bag. Dip it into a glass of starch solution. Observe the solution gradually turns blue.
When copper(II) sulfate and a solution of potassium iodide are mixed, a redox reaction occurs, releasing iodine. Iodine has a property - it passes through some plastics, like one from which the releasable bag is made of. In this case, it happens due to a process called diffusion.
This one and the other safe experiments are waiting for you in the MEL Chemistry subscription!
Warning! Under adult supervision
How can one see diffusion with the help of iodine?
Equipment: releasable bag, copper(II) sulfate, potassium iodide solution, starch solution.
Mix copper(II) sulfate and a solution of potassium iodide in a releasable bag. Dip it into a glass of starch solution. Observe the solution gradually turns blue.
When copper(II) sulfate and a solution of potassium iodide are mixed, a redox reaction occurs, releasing iodine. Iodine has a property - it passes through some plastics, like one from which the releasable bag is made of. In this case, it happens due to a process called diffusion.
This one and the other safe experiments are waiting for you in the MEL Chemistry subscription!
Warning! Under adult supervision
