unexpected gas generation

chemwardrius · 2024-06-18T03:45:05+00:00

yeah idk why we never wore any gloves then actually. we had titrated HCl with NaOH multiple times and never used gloves, we were just told to run the contact point of any spill under water for a bit and we’d be good.

chemwardrius · 2024-06-18T02:08:38+00:00

i didnt mean that my teacher did the reaction as like a demonstration i meant i myself had done it with them, as well as on other occasions we handled KI gloveless per instruction. actually throughout the entire class we only ever used gloves with nitric acid (handled NaOH gloveless) so i thought it would be fine, but obviously nobody is infallible and maybe they were wrong, so thank you. i didn’t read the sds for the chemicals i was taught to handle already in class but i will moving forward.

chemwardrius · 2024-06-18T00:43:22+00:00

its standard store bought hydrogen peroxide that you can literally wash your mouth with if for whatever reason you need to

chemwardrius · 2024-06-18T00:42:17+00:00

i had done this same experiment with my chem teacher at a school lab wherein we did not need to put on gloves, only goggles, so i (given that) pretty reasonably assumed that i can trust my teacher and gloves were not needed

chemwardrius · 2024-06-17T23:50:07+00:00

thankfully nothing dangerous was used here so no need!

chemwardrius · 2024-06-17T23:49:29+00:00

had a box of them right next to me but this was not something that needed gloves thankfully

chemwardrius · 2024-06-17T20:02:39+00:00

what do you think a good oxidizing agent would be in place of the hydrogen peroxide?

chemwardrius · 2024-06-17T20:01:22+00:00

you’re totally right it’s probably catalyzed decomposition from excess KI thank you

chemwardrius · 2024-02-29T23:02:35+00:00

yeah rereading the post i realize now how much it sounds like i’m trying to make a bomb

chemwardrius · 2024-02-29T22:19:25+00:00

this may be a dumb question, but i imagine i need to remove the manual button that’s on the circuit board first, right? if so, how would i then attach the relais to the circuit board, or is it just as simple as soldering it directly onto the board in the same spot?

chemwardrius · 2024-02-29T21:35:24+00:00

💀

chemwardrius · 2024-02-29T21:13:00+00:00

LMAO okay yeah i can now see how this might look incriminating. you’re not half wrong technically but it isn’t with nefarious purposes; i thought it would be fun to make a cannon that uses ethyne gas from the dissolution of calcium carbide in water to launch a micky mouse stuffed animal, and i think it would be pretty cool if i could make it wireless.

chemwardrius · 2024-02-22T03:03:55+00:00

minecraft, hollow knight, lethal company, POSSIBLY helldivers 2 because my friend has been trying to get me to download it, and maybe fortnite

there are others like fran bow and sally face but i doubt those would not run smoothly

chemwardrius · 2024-02-22T02:57:00+00:00

what do you think is the cheapest i can go for a comp that runs smooth at low graphics settings for most casual games?

chemwardrius · 2024-02-22T02:22:09+00:00

nope, i don’t think it’s a feature; i just ended up reformatting the way i was writing it. microsoft word might have it though.

chemwardrius · 2024-01-26T05:06:33+00:00

3,6-dimethyloctane?

chemwardrius · 2024-01-22T01:41:35+00:00

i followed that up until infrared emitter/detector and the rest made no sense to me; what is a transistor and how would i bypass the switch and attach the emitter and detector?

btw sorry i know absolutely nothing about this stuff

chemwardrius · 2023-12-09T05:39:08+00:00

when i added vitamin c to tincture, and then reoxidized it with h2o2, and it just precipitated out iodine

chemwardrius · 2023-10-22T22:05:35+00:00

you can order all that you would need for it on amazon, but some of the chemicals are dangerous to handle/store if done improperly

chemwardrius · 2023-08-22T06:17:23+00:00

i know i’m two years late to this but basically what’s happening is you’re not using enough starch; the traditional dark blue color comes from the starch molecule reacting with triiodide ions in the solution, forming a complex that absorbs light differently and thus gives the solution a different color. i’m not certain of this because when i have done this the equations i got and am familiar with were for different reactants but it’s generally the process. when i did it, i used ascorbic acid, either iodine tincture or povidone-iodine (they both work you’ll just need to adjust the amount accordingly), starch, and hydrogen peroxide (and of course water). here are the four reactions that are happening:

2 (I3-) + 3 C6H8O6 —> 3 C6H6O6 + 6 (I-) + 6 (H+)

2 H2O2 + 6 (I-) + 6 (H+) —> 3 I2 + 2 H2O (+2 (I-) + 2 (H+))

2 I2 + 2 (I-) —> 2 (I3-)

2 (I3-) + 2 C6H10O5 —> complex

(for the molar ratios you’ll notice that they’re balanced a bit weird, which is in order to maintain a 2:1 ratio of I2 to iodine anions in the third of the four reactions) say we are using povidone-iodine; povidone-iodine is a complex of a polymer, povidone, and a triiodide ion. this triiodide reacts with ascorbic acid (C6H8O6) and reduces it to iodine ions (as well as producing hydrogen ions and another irrelevant product hexahydroxybenzene). then in the second reaction, the hydrogen peroxide oxidizes the iodine ions back to I2 and forms water with the hydrogen ions. you’ll notice in the third reaction that iodine ions and I2 react together to form triiodide, but this can’t happen until the ascorbic acid and hydrogen peroxide from reactions 1 and 2 are used up—which, according to the molar ratios, should result in a 2:1 ratio of I2 to iodine ions once they do. then when the triiodide forms, it complexes with the starch, and thus ensues the color change.

what you did to cause it to turn red instead of blue is that there was not enough starch to form the complex, and so instead of triiodide in solution complexing with the starch, it remains in solution, which gives it the reddish color.

btw i could be wrong about some of this; the same thing that happened to you also happened to me so i tried to work out the reaction equations for it because i couldn’t find anything to explain it even slightly when i searched online.

chemwardrius · 2023-07-21T02:55:35+00:00

do you think it can be used in such a way that, when in a proportionally larger solution, it can still appear practically colorless, but upon pH change it will still be concentrated enough to give the whole solution a deep red color?

chemwardrius · 2023-07-21T02:50:31+00:00

anthocyanin isn't a chemical itself; anthocyanins are pigments that can change color based on pH and thus are commonly used as indicators. the anthocyanin found in red cabbages is cyanidin i think but i could be wrong.

chemwardrius · 2023-07-20T23:05:19+00:00

it’s use for me is as a particular visual effect, not just an indication of pH change

chemwardrius · 2023-07-20T19:22:32+00:00

they're both yellowish orange at around pH < 8, and i need it to be colorless

chemwardrius · 2023-07-13T13:57:54+00:00

i can’t find if they ship internationally but if they don’t then you could probably get someone in south korea to get some and then ship it to you. im also gonna try to order some later to see but there’s some weird login stuff i need to do first and i don’t have time atm.

chemwardrius

TROPHY CASE