0:23 The reaction equation is unbalanced - where has the hydroxide ion gone? In reality, iodine reacts with alkali hydroxide to form alkali hypoiodite, which rapidly decomposes (especially when heated) to iodide and iodate. When acid is added, a comproportionation reaction between iodide and iodate to form elemental iodine then occurs. Diluted sulfuric acid is preferable to hydrochloric acid because otherwise side reactions are to be expected (oxidation of hydrogen chloride by iodate to chlorine and formation of the interhalogen). 1:46 Conversely, hydrochloric acid cannot oxidize iodide to iodine, since the chloride ion with the oxidation state -I has no oxidizing effect. This can also be seen from the fact that the reaction equation is again not balanced. The precipitation of iodine after the addition of hydrochloric acid is initially solely due to the effect of the protons on hypoiodite or iodide/iodate. Since the stoichiometric ratio of the reactants is not sufficient for complete conversion to iodine, the addition of a genuine oxidizing agent such as hydrogen peroxide in an acidic environment, as in the present example, can ensure a significantly increased yield.
I always love and appreciate your longer responses to my videos :) you clearly have more education on the theory end of things than I do. My style of doing chemistry is very much: Read Wikipedia, find something interesting, develop a method. I don't spend as much time as I probably should on learning the finer mechanisms at work. Any extra time I have I usually instead spend improving production quality. I have been saying this for a while, but actually doing it is a bit daunting given my already packed schedule but I do want to start doing UA-cam-exclusive high quality videos that are thoroughly researched, produced, and minimum 15 minutes. In any case keep it up with the meaningful feedback, and I was wondering if you have any insight on a quick question considering you have more experience as a UA-cam creator than I do. That is: Do you think videos that while fully legal are still questionable would be tolerated on this platform? I ask because for a while I've wanted to do: Hydroiodic acid, amyl nitrate, silver fulminate, and nitrous oxide but I worry about getting in trouble with UA-cam despite the fact these are all legal to own in the US. What do you think?
@@integral_chemistry I've seen videos of hydroiodic acid, amyl nitrate and various fulminates on YT, just can't remember if I saw any ads on said videos. I doubt they'd be taken down but I'm also not sure they'd get monetised either. 🤔 What route were you considering for the nitrous oxide? That would definitely be an interesting video.
Nice one! Ima definitely try that out as it looks beautiful, fun and doesn't require restricted chemicals. As a side note, reducing the volume of the solution further before reducing the iodide may allow you to get rid off more PVP. Also, that leftover solution was still pretty brown, so there was a significant amount of solvated iodine left. Maybe put the stuff into the fridge to increase yield? Also, the narration was really good in this video; you improved big time!
Yeah you are 100% correct with the further volume reduction in both cases. My issue is I lack patience with watching water boil but this yield could absolutely have been substantially improved if I was just a bit more patient.. I had the same thought especially with the final solution. Also thank you! I'm still getting the hang of it but its certainly getting better.
Povidone iodine contains 1% iodine in molecular state I2 in addition to excipients. The method I have used is reduction with sodium bisulfite and precipitation with calcium hydroxide to remove excipients and povidone.
Strangely, immediately after adding NaOH, a soft brown solid compound appeared. I'm using a 30% NaOH solution, which is normally supposed to contain only water and NaOH, and a 10% Betadine solution. Can you tell me what's causing the problem?
0:23 The reaction equation is unbalanced - where has the hydroxide ion gone?
In reality, iodine reacts with alkali hydroxide to form alkali hypoiodite, which rapidly decomposes (especially when heated) to iodide and iodate. When acid is added, a comproportionation reaction between iodide and iodate to form elemental iodine then occurs. Diluted sulfuric acid is preferable to hydrochloric acid because otherwise side reactions are to be expected (oxidation of hydrogen chloride by iodate to chlorine and formation of the interhalogen).
1:46 Conversely, hydrochloric acid cannot oxidize iodide to iodine, since the chloride ion with the oxidation state -I has no oxidizing effect. This can also be seen from the fact that the reaction equation is again not balanced.
The precipitation of iodine after the addition of hydrochloric acid is initially solely due to the effect of the protons on hypoiodite or iodide/iodate.
Since the stoichiometric ratio of the reactants is not sufficient for complete conversion to iodine, the addition of a genuine oxidizing agent such as hydrogen peroxide in an acidic environment, as in the present example, can ensure a significantly increased yield.
I always love and appreciate your longer responses to my videos :) you clearly have more education on the theory end of things than I do.
My style of doing chemistry is very much: Read Wikipedia, find something interesting, develop a method. I don't spend as much time as I probably should on learning the finer mechanisms at work. Any extra time I have I usually instead spend improving production quality.
I have been saying this for a while, but actually doing it is a bit daunting given my already packed schedule but I do want to start doing UA-cam-exclusive high quality videos that are thoroughly researched, produced, and minimum 15 minutes.
In any case keep it up with the meaningful feedback, and I was wondering if you have any insight on a quick question considering you have more experience as a UA-cam creator than I do.
That is: Do you think videos that while fully legal are still questionable would be tolerated on this platform? I ask because for a while I've wanted to do: Hydroiodic acid, amyl nitrate, silver fulminate, and nitrous oxide but I worry about getting in trouble with UA-cam despite the fact these are all legal to own in the US. What do you think?
@@integral_chemistry I've seen videos of hydroiodic acid, amyl nitrate and various fulminates on YT, just can't remember if I saw any ads on said videos. I doubt they'd be taken down but I'm also not sure they'd get monetised either. 🤔
What route were you considering for the nitrous oxide? That would definitely be an interesting video.
Nice one! Ima definitely try that out as it looks beautiful, fun and doesn't require restricted chemicals. As a side note, reducing the volume of the solution further before reducing the iodide may allow you to get rid off more PVP. Also, that leftover solution was still pretty brown, so there was a significant amount of solvated iodine left. Maybe put the stuff into the fridge to increase yield? Also, the narration was really good in this video; you improved big time!
Yeah you are 100% correct with the further volume reduction in both cases. My issue is I lack patience with watching water boil but this yield could absolutely have been substantially improved if I was just a bit more patient.. I had the same thought especially with the final solution. Also thank you! I'm still getting the hang of it but its certainly getting better.
Povidone iodine contains 1% iodine in molecular state I2 in addition to excipients. The method I have used is reduction with sodium bisulfite and precipitation with calcium hydroxide to remove excipients and povidone.
Which metal was it reacting with the iodine?
That was just a bit of aluminum course grit powder
Thank you, that's beautiful.
would Ca(OH)2 instead of NaOH work???
yes
Can you make HI acid ?
I actually made some a few days ago! I'll have a vid on it soon
Strangely, immediately after adding NaOH, a soft brown solid compound appeared. I'm using a 30% NaOH solution, which is normally supposed to contain only water and NaOH, and a 10% Betadine solution. Can you tell me what's causing the problem?
What can you do with PVP?
I'm not entirely sure. From my very limited reading it seems to be mostly used as a filler in medications.
You can win many minecraft fights with PvP
What is pvp....?
povidone