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DarkHorse posted:I think it's just the limitations of the typical definition of the pH calculation But that's not true at all. The simplified version of the pH calculation is the negative of the base-10 log of the H+ concentration in moles per liter. I'll just write "log" for base-10 log from now on. If we take -log(0.1) for a 0.1 M concentration, we get pH of 1. If we put in the formula for a 1M concentration, it's -log(1) = 0. And if we take the formula for a 10M concentration, it's -log(10) = -1. As you can see I get to zero and negative pHs without ever plugging in negatives in the log formula. You're swapping things around. It's not like you need to use a weird version of the formula for that, it works for the base formula. And it's not even that hard to get to these values with regular strong acids such as sulfuric or hydrochloric. Just get a big enough concentration and it will happen naturally. No weird superacids needed. There is actually a hard limit, by the way: the amount of water molecules in a liter of water (at STP) is 55 mol. That means a concentration of > 55 M in water is literally impossible, by that time you would've replaced all the water molecules with the solvent (the real number would be a bit different because of density changes when you dissolve stuff but let's not make it too complicated here). That means the lowest possible pH using the standard formula would be -log(55) = -1.74 (at STP). If you see any number below that it can't possibly be an actual pH. It's probably the result of a specialized formula to compare superacids or something. And as you can get the pH of a basic solution by using the same formula for the OH- concentration and substracting that from 14, the upper limit for pH would be 14 - - 1.74 = 15.74 (at STP). Edit: like the previous poster said, these numbers are only valid when we work in a watery solution. It's possible to have an acid/base balance in many other solvents but then things get complicated because your notion of "neutral" shifts. For instance, a "neutral" solution in ammonia as solvent is what we'd normally consider very basic, and would probably burn you if you stick your hand in it. One use for this shifted notion of neutral is that it gives you an experimental way to find out the acidity constants of strong acids and strong bases (that by definition all fully dissolve in water, so in water they're impossible to compare). Carbon dioxide has a new favorite as of 13:12 on Aug 29, 2020 |
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Aug 29, 2020 13:08
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Carbon dioxide posted:I don't know if it's related, but in Dutch, constant complainers are sometimes referred to as "vinegar pissers". Makes more sense than the English "full of piss and vinegar" meaning rowdy and energetic
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Aug 29, 2020 13:19
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can we get some graphs about acids and bases thanks in advance
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Aug 29, 2020 13:20
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https://twitter.com/statsepi/status/1299616793703710720
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Aug 29, 2020 15:26
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Aug 29, 2020 16:04
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There is no way that the number of people who describe an eleven o’clock “food consumption occasion” “lunch” is that low.
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Aug 29, 2020 16:07
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Think again, it’s coming from the dinner-at-six crowd. Those people are capable of anything!
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Aug 29, 2020 16:13
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Brunch?
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Aug 29, 2020 16:14
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Does anyone want to play "guess what country the people in that graph live in"? Netherlands Teriyaki Hairpiece has a new favorite as of 16:32 on Aug 29, 2020 |
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Aug 29, 2020 16:21
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No loving way dinner is at 18:00, that's the afternoon snack. Dinner is at 21:00 at the earliest.
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Aug 29, 2020 16:27
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ITT: Spaniards
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Aug 29, 2020 16:29
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11 AM lunch and 5 PM dinner for me thanks
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Aug 29, 2020 16:38
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Alkydere posted:For me sometime after 2015. I did two years of engineering in college before I switched to political science+5 different minors and the quick math brain is something I still have too. It’s super handy when I have to calculate a dose of a medication using milligrams/kg and have the patients weight in pounds. Doing endless unit conversions has turned it basically into a reflex.
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Aug 29, 2020 16:42
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Chin Strap posted:11 AM lunch and 5 PM dinner for me thanks Vale Vejo
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Aug 29, 2020 16:43
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Ugly In The Morning posted:I did two years of engineering in college before I switched to political science+5 different minors and the quick math brain is something I still have too. It’s super handy when I have to calculate a dose of a medication using milligrams/kg and have the patients weight in pounds. Doing endless unit conversions has turned it basically into a reflex. convert this into metric please https://twitter.com/lunasorcery/status/1299409957541023744
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Aug 29, 2020 17:44
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Tunicate posted:convert this into metric please Gotta find how many people in any given year are born with the initials “k m”.
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Aug 29, 2020 18:01
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Before reading the description of the metric I thought they were multiplying the average body length of a newborn by the number of births per hour. Like, in a if-you-lined-all-these-newborns-end-to-end kind of deal.
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Aug 29, 2020 18:08
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HerStuddMuffin posted:Before reading the description of the metric I thought they were multiplying the average body length of a newborn by the number of births per hour. Like, in a if-you-lined-all-these-newborns-end-to-end kind of deal. 
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Aug 29, 2020 18:13
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Tunicate posted:convert this into metric please what the heck happened in the 80s
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Aug 29, 2020 18:35
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Laymen thinking pH doesn't go below 0 or above 14 wrap around to being correct because there are better physical properties for predicting interactions at those points. Whoever started putting "pH" of superacids in the paper's press release should be shot, laymen understanding be damned.
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Aug 29, 2020 18:40
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Watermelon Daiquiri posted:what the heck happened in the 80s We got fed up with people trying to insist that we name our kids "Kilometers".
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Aug 29, 2020 18:47
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Tunicate posted:convert this into metric please  wait i didn't read the post
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Aug 29, 2020 19:32
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Tunicate posted:convert this into metric please That's fine, but how many were named Miles Prower?
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Aug 29, 2020 19:40
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Watermelon Daiquiri posted:what the heck happened in the 80s Miles O'Keeffe's first film role was in 1981. 
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Aug 29, 2020 19:46
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Watermelon Daiquiri posted:what the heck happened in the 80s Tuesday, November 24, 1992. Sonic Twosday.
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Aug 29, 2020 23:18
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HerStuddMuffin posted:Before reading the description of the metric I thought they were multiplying the average body length of a newborn by the number of births per hour. Like, in a if-you-lined-all-these-newborns-end-to-end kind of deal. Sort of like the statistic that an average head is producing an inch of hair every minute (or five feet per hour). Source: https://xkcd.com/2316/
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Aug 30, 2020 00:41
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Powered Descent posted:Sort of like the statistic that an average head is producing an inch of hair every minute (or five feet per hour). Hair is pretty strong, that could be a lucrative option for the market savy millennial.
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Aug 30, 2020 01:34
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HerStuddMuffin posted:Before reading the description of the metric I thought they were multiplying the average body length of a newborn by the number of births per hour. Like, in a if-you-lined-all-these-newborns-end-to-end kind of deal. (11.979 babies)/(1000 people)*(328200000 people in US)*(19.69 in/baby)/(12 in/ft)/(5280 ft/mi)/(365 days/non-leap year)/(24 hours/day) = 0.1395 miles of baby per hour in the US in 2019. Interesting that we get more baby Miles per hour than baby miles.
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Aug 30, 2020 01:53
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Watermelon Daiquiri posted:what the heck happened in the 80s Lot of big Miles O'Brien fans from the instant The Next Generation aired
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Aug 30, 2020 02:43
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Sep 1, 2020 16:07
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Somebody make an edit with another, much longer bar in bright green, with „The Matrix“ as label
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Sep 2, 2020 11:49
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Russia: 3x better than ancient Egypt!
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Sep 3, 2020 02:20
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Neco posted:Somebody make an edit with another, much longer bar in bright green, with „The Matrix“ as label It's not quite what you asked for but I think it works better. 
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Sep 3, 2020 06:49
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Che Delilas posted:It's not quite what you asked for but I think it works better. Awesome and fair enough. Now you could add some „Creative X-Fi“ on top of the matrix bar so it‘s even better than the US
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Sep 3, 2020 06:59
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Neco posted:Awesome and fair enough. Now you could add some „Creative X-Fi“ on top of the matrix bar so it‘s even better than the US Sorry but I'm out of human energy for the day
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Sep 3, 2020 07:11
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Che Delilas posted:Sorry but I'm out of human energy for the day as are we all, friend
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Sep 3, 2020 14:15
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Total BS, where's the hole left by the Christian dark ages?
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Sep 3, 2020 17:31
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Not to mention the Finno-Korean Hyperwar.
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Sep 3, 2020 17:59
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SerialKilldeer posted:Total BS, where's the hole left by the Christian dark ages? This but counterstrike. Does anyone have that one on hand? I wanted to show it to a friend but didn't manage to google myself to it.
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Sep 3, 2020 18:01
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https://twitter.com/SwipeWright/status/1302512247315419136
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