What do you use to make up large vol of solution.

Satu11 · Post by **Satu11** » 05 Mar 2010, 12:32

Hi could anyone please help me with this...
I need to make up 10 L of iodine solution.The largest bottle I have of 2.5lit and the teacher want me to make up the all solution together so that all students get the same solution.Do you think it will be okay if I use plastic buckets for iodine solution.

Thanx.

MariaC · Post by **MariaC** » 05 Mar 2010, 13:14

Sorry but what on earth do they want with 10L of iodine solution, are you disinfecting a hospital???

MariaC

fibreweb · Post by **fibreweb** » 05 Mar 2010, 13:16

What are they doing with 10 l of iodine.

The amount staggers me. All we ever use are a few mls at a time. I make up 1 litre about 3 times a year for 1100 students.

I suppose a bucket, or if you have a jerry can or something that is protected from light.

Wendy

Voice · Post by **Voice** » 05 Mar 2010, 14:11

I might make the iodine up and put it in a bucket so that the concentrations all end up the same,but I would not keep it there. Imagine the smell!!!!
A gerry can is a great idea. I know I have made up 10L of Polyvinyl and kept it in 2 5 Litre plastic containers from Bunnings. Fantastic! I did not have to make it up again for the rest of the year.
Why so much?????????
Maree

Post by **RosalieM** » 08 Mar 2010, 09:04

They can't possibly mean 10L of Iodine!! What on earth could they use all that for? Especially when anything other than a few drops is supposed to be used in a fume cupboard... I can't think of any pracs that would require more than a few drops at a time. If I were you I would be questioning if this is what they REALLY want or have they just had a bad day and told you the wrong thing. Double checking sure beats making up the wrong amount or the wrong substance!! I would be interested to hear what they want it for...

Ocean Breeze · Post by **Ocean Breeze** » 08 Mar 2010, 10:09

Satu11

can you please let us know what that much of iodine is being used for?

SOOO curious now. Have never been asked to make up that much before in my life.
Maybe to disinfect a pig farm after an outbreak of foot-in-mouth disease?

Anyway, to answer your question. Large amounts.
I use a 4 L volumetric flask ( or a few smaller flasks if you dont have a big hunker like me!). I make up batches, Then I pour them into several clean plastic laundry buckets, & homogenise them, by pouring back & forth until thouroughly mixed. Then decant into reagent bottles. That way, they are all the same conc.

Satu11 · Post by **Satu11** » 08 Mar 2010, 11:26

Hey Thanx for the all the post and concern...

I have to make 10L of iodine solution cos' our year 12 chemistry classess of 20 students are doing Vitamin C and sulfur dioxide analysis.For this they need to do titration and there are 10 groups.So the teacher wants 1L of iodine solution for each group. Hope this all makes it clear...

Post by **RosalieM** » 08 Mar 2010, 11:48

Iodine Solution - from Chemwatch

Risk Statements:
May cause SENSITISATION by inhalation and skin contact.
Harmful to aquatic organisms.
Cumulative effects may result following exposure*.
* (limited evidence).

Safety Statements:
Do not breathe gas/fumes/vapour/spray.
Wear suitable protective clothing.
To clean the floor and all objects contaminated by this material use water.
Keep away from food drink and animal feeding stuffs.

Is there not another less risky prac to do? According to CSIS that we use here in NSW it is toxic by all routes of exposure.

fibreweb · Post by **fibreweb** » 08 Mar 2010, 12:20

A burette only holds 5o mls, and most titrations are done using 25 ml amounts so that would give them enough Iodine for 40 runs, the usualy is only about 5 or under.

I think the teacher may have overcalculated the amount needed for each group.

We give 250 mls on the solution to be titrated to each of our students in their assessment task. ( most often HCl)

I'm just concerned about you trying to make and disolve that much Iodine and then most likely having so much left to dispose of.

Wendy

Satu11 · Post by **Satu11** » 08 Mar 2010, 14:28

Thanx once again..
I discussed it with the teacher and teacher said that students will be doing upto 16 titration so if they use 25-30mls each tme and that makes around 500ml each group.Plus teacher wants the some extra for rinsing the burette and plus if something goes wrong.Anyways I talked her into making 8L and I have made up that....

sunray18 · Post by **sunray18** » 09 Mar 2010, 10:40

You can buy 20l plastic containers from Bunnings or reject shops.. or buy 20L of water from woolies, empty the water out and use the container - it wont last long because the iodine will start disintegrating it - but will be useful short term...

fibreweb · Post by **fibreweb** » 25 May 2010, 11:44

Hi Satu11

I know it's now quite some time ago, but I have wondered if the teacher used all the 8 litres of iodine solution that you made up for her for the Vitamin C titrations.

Wendy

Post by **Ocker** » 25 May 2010, 13:40

When I mix up Iodine I put some in ethanol and shake until I have saturated solution then dilute with water but could never give an accurate molarity.
For a titration you are relying on accurate concentration

Australia's Science Forum

What do you use to make up large vol of solution.

What do you use to make up large vol of solution.

Re: What do you use to make up large vol of solution.

Re: What do you use to make up large vol of solution.

Re: What do you use to make up large vol of solution.

Re: What do you use to make up large vol of solution.

Re: What do you use to make up large vol of solution.

Re: What do you use to make up large vol of solution.

Re: What do you use to make up large vol of solution.

Re: What do you use to make up large vol of solution.

Re: What do you use to make up large vol of solution.

Re: What do you use to make up large vol of solution.

Re: What do you use to make up large vol of solution.

Re: What do you use to make up large vol of solution.