ramssuperbowl99 Posted April 8, 2018 Share Posted April 8, 2018 (edited) 19 minutes ago, twslhs20 said: A single extraction with 100 mL of CHCl3 extracts or removes 88.5% of the weak acid, HA, from 50 mL of aqueous solution. What is the partition coefficient, K, for HA at a pH = 3.00? The Ka for HA is 3.5 x 10-5. A single extraction with 100 mL of CHCl3 extracts or removes 88.5% of the weak acid, HA, from 50 mL of aqueous solution. What is the Distribution coefficient, D, for HA at a pH = 3.00? The Ka for HA is 3.5 x 10-5. 1. So since the pH < Ka, it makes sense that we're able to extract HA. Since the partition coefficient is concentration ratio and the volumes are different, we split it out and since I'm lazy assume 100 mg of HA. Kp = (Conc in Chloroform)/(Conc in Water) = [(88.5 mg)/(100 mL)]/[(11.5 mg)/(50 mL)]. Units are the same so they cancel out. 2. Distribution is pH-dependent where D = [(Kp)*(H+ Conc)]/[(Ka+(H+ Conc)] pH of 3 gives you an H+ conc of 10^-3 (Side note: Sorry this does not translate on a football forum without subscripts). You've got the KA from the problem and you've got the Kp from part 1. That help? Edited April 8, 2018 by ramssuperbowl99 2 Link to comment Share on other sites More sharing options...
D82 Posted April 8, 2018 Share Posted April 8, 2018 Now that I have a headache... 2 Link to comment Share on other sites More sharing options...
twslhs20 Posted April 8, 2018 Share Posted April 8, 2018 2 hours ago, ramssuperbowl99 said: 1. So since the pH < Ka, it makes sense that we're able to extract HA. Since the partition coefficient is concentration ratio and the volumes are different, we split it out and since I'm lazy assume 100 mg of HA. Kp = (Conc in Chloroform)/(Conc in Water) = [(88.5 mg)/(100 mL)]/[(11.5 mg)/(50 mL)]. Units are the same so they cancel out. 2. Distribution is pH-dependent where D = [(Kp)*(H+ Conc)]/[(Ka+(H+ Conc)] pH of 3 gives you an H+ conc of 10^-3 (Side note: Sorry this does not translate on a football forum without subscripts). You've got the KA from the problem and you've got the Kp from part 1. That help? That makes more sense. Really appreciate it. Link to comment Share on other sites More sharing options...
ramssuperbowl99 Posted April 8, 2018 Share Posted April 8, 2018 1 minute ago, twslhs20 said: That makes more sense. Really appreciate it. No problem. Feel free to shoot me a PM if you need anything else. Link to comment Share on other sites More sharing options...
FinneasGage Posted April 8, 2018 Share Posted April 8, 2018 3 hours ago, twslhs20 said: A single extraction with 100 mL of CHCl3 extracts or removes 88.5% of the weak acid, HA, from 50 mL of aqueous solution. What is the partition coefficient, K, for HA at a pH = 3.00? The Ka for HA is 3.5 x 10-5. A single extraction with 100 mL of CHCl3 extracts or removes 88.5% of the weak acid, HA, from 50 mL of aqueous solution. What is the Distribution coefficient, D, for HA at a pH = 3.00? The Ka for HA is 3.5 x 10-5. dog this **** was the source of all my frustration in life 2 years ago. switched my major cause i could never figure this stuff out. only classes i ever failed were the 2 chemistry classes i tried. Link to comment Share on other sites More sharing options...
twslhs20 Posted April 8, 2018 Share Posted April 8, 2018 3 hours ago, jfinley88 said: dog this **** was the source of all my frustration in life 2 years ago. switched my major cause i could never figure this stuff out. only classes i ever failed were the 2 chemistry classes i tried. Haha, Its not Easy. PChem and Calculus are my last big hurdles to finish my degree. All the other classes are pud business classes. Just gotta grind 4 more weeks and I get a break. Link to comment Share on other sites More sharing options...
CWood21 Posted April 8, 2018 Share Posted April 8, 2018 4 hours ago, jfinley88 said: dog this **** was the source of all my frustration in life 2 years ago. switched my major cause i could never figure this stuff out. only classes i ever failed were the 2 chemistry classes i tried. Units. I remember my teacher the first year I had a class was a ****** about units, and then I took it in college and I understood why. Link to comment Share on other sites More sharing options...
Ty21 Posted April 8, 2018 Share Posted April 8, 2018 5 hours ago, ramssuperbowl99 said: No problem. Feel free to shoot me a PM if you need anything else. Nice 1 Link to comment Share on other sites More sharing options...
TheChancellor Posted April 8, 2018 Share Posted April 8, 2018 9 minutes ago, Tyty said: 5 hours ago, ramssuperbowl99 said: No problem. Feel free to shoot me a PM if you need anything else. Nice Go for it mate. Link to comment Share on other sites More sharing options...
MacReady Posted April 8, 2018 Share Posted April 8, 2018 Anybody else ever have a hernia? I had my first hernia repaired in April of 2017 and now I have another one that's gonna need to be repaired a year later. I'd just ignore it, but they're really damn annoying, and I'm paranoid of it becoming serious. Link to comment Share on other sites More sharing options...
twslhs20 Posted April 9, 2018 Share Posted April 9, 2018 1 hour ago, CWood21 said: Units. I remember my teacher the first year I had a class was a ****** about units, and then I took it in college and I understood why. Yeah converting from mm to um, back to m and then to cm is a real pain in the arse. Link to comment Share on other sites More sharing options...
ET80 Posted April 9, 2018 Share Posted April 9, 2018 Looks like you're all making crystal meth. 1 Link to comment Share on other sites More sharing options...
Ty21 Posted April 9, 2018 Share Posted April 9, 2018 12 minutes ago, EliteTexan80 said: Looks like you're all making crystal meth. I've had enough cancer to make me the ring leader Link to comment Share on other sites More sharing options...
Ty21 Posted April 9, 2018 Share Posted April 9, 2018 Hooked on Comedians in cars getting coffee even tho Jerry Seinfeld is a closed minded idiot d*ckbag Link to comment Share on other sites More sharing options...
theJ Posted April 9, 2018 Share Posted April 9, 2018 9 hours ago, Desperado82 said: Now that I have a headache... I used to be able to do that stuff. Life is making me dumber... Link to comment Share on other sites More sharing options...
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