Science Buddies: "Ask an Expert"

Hi, I'm trying to test the vitamin c levels in fruit and in the link below found from the project here on science buddies, "Which Orange Juice Has the Most Vitamin C" it says to use water in the steps in preparing the solid iodine solution. One of my science teachers was saying that iodine doesnt dissolve or at least easily in water but the iodine I believe is being mixed with potassium iodide which can dissolve in water. I was just wondering what the best way to prepare solid iodine is?
http://www.outreach.canterbury.ac.nz/ch ... iodine.pdf

Hi,

It sounds like you are doing this great project from the Science Buddies website.

https://www.sciencebuddies.org/science- ... p044.shtml

The specific directions for making Lugol’s iodine solution are given in the link you posted. If you add potassium iodide to the iodine, it will dissolve in water:

“ Weigh 2 g of potassium iodide into a 100 mL beaker. Weigh 1.3 g of iodine and add it into the same beaker. Add a few mL of distilled water and swirl for a few minutes until iodine is dissolved.”

Please post again in this topic if you have more questions.

Donna Hardy