iodine for photosynthesis
iodine for photosynthesis
Hi - its an age old question but I need to ask it again. What recipe do you use to make your iodine for the Starch in leaves prac? yr 11 Bio
- fibreweb
- Posts: 620
- Joined: 20 Jul 2006, 10:00
- School: Oxley High School
- Suburb: Tamworth
- State/Location: NSW
Re: iodine for photosynthesis
I use 15gm Potassium Iodide plus 3 gm Iodine in 1 Litre of Distilled Water.
It takes a while to dissolve.
I have had few complaints in 10+ years
It takes a while to dissolve.
I have had few complaints in 10+ years
- rae
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- School: Oxley College
- Suburb: Burradoo
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Re: iodine for photosynthesis
I do the same as Fibre web.
- Graham Kemp
- Posts: 173
- Joined: 22 Nov 2011, 09:21
- Job Title: Laboratory Assistant
- School: St John's School
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- State/Location: QLD
Re: iodine for photosynthesis
It's called Lugol's Iodine Solution. (I2/KI).
For school practicals use: 15g KI, 3g I2, disolved to 1000L volume in H2O.
First disolve the potassium iodide in just a small amount of water (~20mL), then add the iodine to this. Only once the iodine is disolved, do you make up to final volume.
A small but concentrated KI solution will more quickly disolve the I2 than large but dilute one.
Crushing the iodine with a mortar and pestle may also help speed up the disolution process.
Store in brown glass, and in a cool and dark storage area.
For school practicals use: 15g KI, 3g I2, disolved to 1000L volume in H2O.
First disolve the potassium iodide in just a small amount of water (~20mL), then add the iodine to this. Only once the iodine is disolved, do you make up to final volume.
A small but concentrated KI solution will more quickly disolve the I2 than large but dilute one.
Crushing the iodine with a mortar and pestle may also help speed up the disolution process.
Store in brown glass, and in a cool and dark storage area.
- fibreweb
- Posts: 620
- Joined: 20 Jul 2006, 10:00
- School: Oxley High School
- Suburb: Tamworth
- State/Location: NSW
Re: iodine for photosynthesis
Thanks Graham for that tip.
The length of time it has taken for Iodine to dissolve has frustrated me numerous times in the past
I have just added it to the relevant page in my "The Laboratory"
![Thumbsup :thumbup:](./images/smilies/thumbsup.gif)
The length of time it has taken for Iodine to dissolve has frustrated me numerous times in the past
I have just added it to the relevant page in my "The Laboratory"