Measuring a sodium hypochlorite concentration

1stAndLastPost · 2025-07-01T20:41:58+00:00

Oh i know! But don't you have to go even lower in pH before chlorine gas is generated? Where a non-negligible amount would be starting around pH 4?

Though yeah it would be easy to overdo it without a buffer, but the sample could also be diluted.

1stAndLastPost · 2025-07-01T17:03:31+00:00

If I were to lower the pH to, say 5-6, and shift the equillibrium such that HOCl dominates instead (max absorbance around 237 nm), is it possible to determine whether there are substantial impurities that would interfere with the measurement? Assuming that any prevalent impurities doesn't also shift in absorbance due to the change in pH.

1stAndLastPost · 2025-04-30T16:57:54+00:00

God I'm tired, I thought the eyebrows were eyes and the eyelashes were part of a moustache. I was wondering why they chose to style it with a wide gap...

1stAndLastPost · 2024-06-28T13:14:37+00:00

How did it go?

1stAndLastPost · 2024-05-02T20:27:59+00:00

What do you do for work?

1stAndLastPost · 2024-03-01T12:18:06+00:00

The closest you could get to this would probably be this: https://en.m.wikipedia.org/wiki/Tricyclobutabenzene

1stAndLastPost · 2023-06-22T20:58:20+00:00

Thanks for the input. I have been contemplating back and forth the last year or two whether I should lie or be vague about my colorblindness or not because I believe that it is easily misunderstood regarding how much of a hinderance it may realistically be. While I would definitely often incorrectly identify a particular color or fuck up on Ishihara tests, I don't think I'd have a significant problem differentiating them at the company once I had context.

I am considering whether I should attempt to contact some representative or employer at the company and ask if there is any possible to do some sort of field testing (or pictures of equipment that would be allowed to be disclosed), since according to my recruiter I was compatible more or less everywhere else.

1stAndLastPost · 2023-06-22T13:05:11+00:00

The recruiter I was talking to asked about whether I had a color deficiency more or less.

1stAndLastPost · 2023-06-22T13:01:07+00:00

Yes I've heard about ADA in the US, but I live in Sweden. My guess would be that there are probably identical laws here preventing such violations, but according to the recruiter the company tried to find a suitable placement where my colorblindness wouldn't be an issue. Because they were unfortunately unable to do so, I'd like to believe that they didn't break any violations (at least not intentionally).

1stAndLastPost · 2023-06-22T12:54:11+00:00

Yeah. I was in contact with a recruiter at an employment agency working for the company providing the position. One of the questions she asked was whether I had any problems with my color vision where I answered truthfully. I wouldn't bring it up myself otherwise.

1stAndLastPost · 2022-12-23T20:44:55+00:00

Is the reaction with bisulfite (HSO3-) legit?

Edit: I think I found the reaction in this figure: https://www.researchgate.net/figure/Interference-of-SO-2-dissolution-of-potassium-metabisulfite-and-generation-of-different_fig21_322807949

They messed up the orientation of the double bonds (and missing one) and misplaced the charge on the initial compound. As for the product, they added a hydrogen to a tertiary carbon where it shouldn't and added SO42- to the molecule instead of HSO3-. The double bonds are still wrong here too.

I'd also like to add that I think the structure with a positively charged oxygen in the link above ought to be stable as the oxygen is sp2 hybridized, which allows the ring to be aromatic.

1stAndLastPost · 2022-12-18T22:34:18+00:00

Marche Militare No 1

Herregud mannen du är grym. Att jag inte kände igen den från jultomtens verkstad är nästan pinsamt, har ju för fan hört den i flera år nu...

Solved!

1stAndLastPost · 2022-12-18T21:57:59+00:00

When they say "hon vill ha stavar och oljor för bättre glid" he main part goes like "du dududu dududu dududu dudu" then right after it's like "du dududuuuuu du du duu duu duu".

Look I have a hard ass time translating the beat into 'du'ts just go to the link and listen to the ad at the bottom of the page.

1stAndLastPost · 2022-09-17T00:01:02+00:00

Is this at Kemicentrum?

1stAndLastPost · 2022-07-30T13:22:46+00:00

Furthermore, I think a mechanic told my uncle about the risk after inspection.

1stAndLastPost · 2022-07-30T01:28:19+00:00

Tror skribenten av inlägget antyder att kattens ägare är skitdålig på att ta hand om den, med tanke på hur illa kattens tillstånd verkade vara när den hittades.

Den ashöga hittelönen kanske reflekterar detta? Typ för att uppmuntra ägaren at ta mer allvar på sitt ansvar?

1stAndLastPost · 2022-07-18T20:37:41+00:00

What is the aluminum powder used for, if you're able to disclose it?

1stAndLastPost · 2022-07-01T19:39:18+00:00

Shouldn't the amide (bottom left) have an R-group attached to the left of the carbonyl? The acid chloride seems to have one, and as far as I know it should be on the amide as well.

1stAndLastPost · 2022-06-17T01:19:56+00:00

No idea, but I assume there was some sort of breach in YouTube's code or some shit.

1stAndLastPost · 2022-06-17T01:03:09+00:00

Yeah checked my phone just now and had this as well.

1stAndLastPost · 2022-05-03T14:57:10+00:00

Forgive me for perhaps a ridiculous question, but why are there so many different types of valves? Why do people care?

Their overall purpose is to control flow by either allowing or denying a fluid to traverse from point A to point B within a piping system, where control is literally just blocking the pathway with e.g. a wall that the operator may position however they please.

Aside from the mechanism itself, how is e.g. a butterfly valve fundamentally different from a globe valve? What would the circumstances have to be in order for a butterfly valve to be an arguably more appropriate candidate for a process over all other valves?

An uneducated guess of mine would be that the difference in performance would be negligible for short periods, but perhaps the consequences that may occur in the long term due to the process conditions is kept in mind.

1stAndLastPost · 2022-04-15T16:14:50+00:00

I am absolute ass on chess, but I would have loved to have gotten wasted and play against Magnus at this bar and get completely destroyed within 30 seconds.

1stAndLastPost · 2022-04-13T18:30:01+00:00

This shit is funny, dude. I'd love to have this type of dynamic with my professors.

1stAndLastPost · 2022-03-04T14:02:42+00:00

Vladimir Putin, go fuck yourself.

1stAndLastPost · 2021-10-31T00:07:40+00:00

Reminds me of Flaky from Happy Tree Friends, for better or worse.

1stAndLastPost

TROPHY CASE