Yet another chemistry class from hell, the longest and most ridiculous one yet:
Let's go to this- quiet please, the tests were pretty good for the most part. Listen up please, quiet please, so I can get to this- let's talk about this thing that's your acid- Donate! H2O proton gives to this guy H2O you lose that proton, this is my acid- negative charges are bases. That's my acid. What's this one on this side a plus one charge, what is gives it -sh- gives it to this one. Acids are always donors of H+ I think Lewis and Lowry in this case- right? That's an acid NO3-1 this guy is this is the base right? On this side. Okay? That's what- that's what we have.
Now I wanna talk about a little math here- powers of ten. Powers of ten! Any questions on this stuff? Let me go down here. Powerpoint with a swimming pool- okay so couple of things you might wanna jot this thing down somewhere. Strongest acids completely break apart- strong acids! Alright, so um...
[Unnecessarily long pause]
K so um the ones that are weak are not dangerous- that's not true, it doesn't break into solution a lot. Strong or weak- alright? These are strong- that you should probably memorize I'll give you these, so anyway, so that's how we measure strength of acids, that's just a take home thing. Any questions about this so far?
The weak acids like I said just the weak ones- much more dangerous than sulfuric acid, it's actually kind of scary to work with in the industry. Okay sometimes they write it this way or this way, the ion is acetate, they give it to you without- be aware of that. The light bulb is uh, not as strong but it goes on soft drinks, you know carbonation, to me this guy attacks- if it falls on your arm it goes right through the skin. Years ago I knew a guy he didn't feel it but in the shower he looked- he saw a little hole in his arm! The shit(?) when you buy it, the bottle this stuff right here- airplane components.
Here we go, now water ionizes by itself. WATER AND WATER! If this is the acid that's the base you got the point? It does do that as well, this one- this one. H+ very good, same thing. Without water you guys- water gives us that capability, this is how it ionizes, listen up please sh-sh-sh-sh-shh... So they... They spell constant with a K I think it's from a German thing, the constant(konstant?) for water you guys is this times that AND when you take the log of this you gonna add them together. Okay? Moles per liter. That means what? Can I go on here? Okay? That means you guys they ionize by itself, so let me show you- look for example for the, uh, this one, add up to times ten to the minus seven- just seven. Water has neutral pH what they refer to as SEVEN. Alright. I wanna tell you where it COMES from.
Let me just keep going here, this is just a thing I do with Powerpoints for example- so for example if this guy is this concentration, let me show you, that's the deal. This number divided by that number like pi- this guy right here. I don't know, I always accepted it if you solve for that, that's what you uh... That's what I got anyway and then there you are. That's how you do every one of those problems. Yeah. Okay. Alright- alright.
Let's see... Don't... Let's... Hold on. Remember this -sh- as you can see, um let me just do this real quickly here, water has that kind of a green color to it- if you want at home get some purple cabbage, test all kind of things in your houseHOLD. That's the- That's the color for an acid. Let me see here. LOOK- a base here, I got a low concentration, base is gonna be well uh, point- point that's... That. Oh I have some acid, I can actually mix it easier. Less than seven gives you that color which I have to still make goes PINK. They use ozone these days.
Anyway pH- HYRDOGEN POWER! Minus a low- guys, okay now in math class, sh- listen up please SHHHH. Minus sign here- that's the definition of pH it's right there- hydrogen POWER, a little bit like that. Then if you know this you don't need to know that- I'll show ya. If I find the pH, seven plus seven is fourteen. That's a formula you wanna jot down all the time- K? Opposite for this one though, be aware. QUESTIONS?! Questionsssssss...?
That becomes easy, now to me it's just...
Now for example plus it in minus log of thaat- minus TWO 'cause I'll show you. Look- SO, is that clear? I can, if I have this in front of me I don't need a calculator at all. I'll show you. That's easy right? Here we go! Here we go -sh- let me show you, on right there that is really easy.
Here we go, here we go- I've got it right here, turn on the AC I'm getting kinda... Alright, everybody with me? Alright um if you have a calculator... Who doesn't have one? These tables are fast! Haha! Let me show you, okay guys look, here we go -sh-sh-sh- minus a log, I'm gonna put pH. I can do this right away, just eight right? Four point five, see the letter N? N? N? N value- N value is forty five- four point five, it should be a big number right? I don't wanna do that so minus- so eight minus this is what? Lot faster. You guys get that? Okay. Alright. Now. Mental gap?
Alright let me- so okay, alright- okay let me show you. Sh. Column number one. I'm gonna do this one, I'm gonna go to the next one so please listen- Column number TWO! Th-this! H+ this? So please listen, ten to the minus equals to the molarity to the one here. Three point seven eight. You're not gonna leave it like that- Look. It gets harder, you've got to pay attention, here ten to the minus pH, that's a lot. Column number TWO is the molarity. Is that clear?
[Unanimous chorus of "No"]
[Exasperated] Guys come on now, column number two- I want the molarity! Same thing so give me the molarity, let's- okay so this one here you have to solve it out between three and four. Yes it is! One point six four that's the molarity, SO, k now, here we go- look. Column three guys, column number three right? Right? Got that? You can do the water, look to me this is easier- that's it.
By now you're probably noticing a pattern. He's like this every time he "teaches" us something new. Which is every day. We don't review things. Ever. At least I don't think we do, it's hard to tell.
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