[leas]

Im titrating orange juice with 5% Lugols solution (6.5mg iodine per drop) to find the vitamin C concentration. I added ten drops 0.5% starch solution and need the endpoint to be at about 10 millilitres of titrant. How do I find out how many Moles I need to dilute the iodine to or how much I currently have? I thought about diluting it 250:1 to create 0.01M iodine but the endpoint won't appear so I think I'm wrong.

Thanks if anyone helps, I haven't studied chemistry before.

[Borek]

Im titrating orange juice with 5% Lugols solution (6.5mg iodine per drop)

Huge drop I would say, I would expect about five times less iodine (assuming about 20 drops per mL).

need the endpoint to be at about 10 millilitres of titrant. How do I find out how many Moles I need to dilute the iodine to or how much I currently have?

Not knowing even the approximate vit C amount you can't do much.

See if http://www.titrations.info/titrant-and-sample-volume helps