Most welcome, Pranita

Glad it helped! Isha. Thank you for watching

Sir can iodine value be used for triple bond unsaturated compound? Or we use this only for double bond unsaturated compound? Please tell.

@@Learner_being it is used for double bonds as they are commonly found in veg oils. I am not sure about its application in triple bond determination

Many thanks

Thanks and welcome.

Thanks for watching, Daniel. We should rinse with 15 ml potassium iodide solution and pour the rinsate in the flask. Potassium iodide dissolves all Iodine fumes those are trying to escape through the gaps of stopper & neck. This ensures accuracy in the Iodine value measurements.

Many thanks Pola. A 10-15% w/v Aq KI solution would be sufficient. Purpose is to trap all Iodine fumes escaping from the gap of stopper & iodine flask.

Thank you Ramdas. I've been using Iodine monochloride. It is corrosive and needs to be handled carefully (mask, gloves and glasses etc are advisable)

CCl4 or chloroform acts as diluent, it also provides a common medium for the reactants to react. (or else, oil will float on the water and cannot react) Thirty minutes is the maximum time required for I-Cl to bind with the double bonds of oil. It ensures that binding is complete (for 1 g of oil).

Na2S2O3 sodium thiosulphate (one of the few stable reducing agents) converts (reduces) iodine to iodide form. Na2S2O3 first reacts with iodine before iodine (I2) can form a complex with starch to give (blue-black color). Once all thiosulfate is utilized excess iodine now forms a complex with starch. This helps us to get accurate end point

@@bhushansongthank you for your reply