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Monday, February 13, 2012

About Henderson Hasselbach equation

Henderson Hasselbach equation?
I am stuck on one question of my home work: Vitamin C has a pk of 4.2. according to the henderson hasselbach's equation, how much of vitamin C molecules in human blood (pH = 7.4) are protonated? How would i go about solving this?? I need it in a simple sort of way, if possible!
Chemistry - 1 Answers
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1 :
Lancenigo di Villorba (TV), Italy HASSELBACH equation treats onto WEAK ACIDs (or WEAK BASEs) DISSOCIATION IN AQUEOUS MEDIA. Well, this equation comes from LOGARITHMIC ARRANGEMENT OF CHEMICAL EQUILIBRIUM OF IONIC DISSOCIATION for a weak acid as Vitamin C is. So, Vitamin C may be named as C6H8O6 ; IT PLAYS LIKE AN ACID ONCE IT TOOK PART TO THE EQUILIBRIUM C6H8O6(aq) <---> C6H7O6-(aq) + H+(aq) K = 6.0E-5 = |C6H7O6-| * |H+| / |C6H8O6| HASSELBACH LOGARITHM will be the equation you look for pH = pK - LOG[|C6H8O6| / |C6H7O6-|] and once you play at pH=7.4, I MAY CALCULATE THE CHEMICAL RATIO ABOUT VITAMIN C |C6H8O6| / |C6H7O6-| = ALOG[pK - pH] = ALOG[4.2 - 7.4] = = 6.0E-4 THE CALCULATION SAYS YOU THAT A PERCENT FRACTION 6.0E-4 / (6.0E-4 + 1) = 0.06% HAS TO RESULT THE PROTONATED PART OF VITAMIN C IN A MEDIUM HAVING pH=7.4. I hope this helps you.

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Friday, January 13, 2012

About Piano lessons in Henderson, NV


Piano lessons in Henderson, NV?
I like private lessons in someones home, but whatever you can find would help. I searched forever, but I can't find anything. Please help. Henderson or Las vegas, NV area would work. Thanks!
Las Vegas - 1 Answers
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1 :
check the phone book and the free papers.

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Tuesday, December 13, 2011

About : Work at home

Work at home?
anyone know of a company in henderson, las vegas nevada that you can work at home or a place where you go pick up data entry work and take it home to do? I really need to find a company like this?
Las Vegas - 7 Answers
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1 :
you can start your own Monavie business - it has been great for me - some extra income every week - and the product helped my son stop getting migraines. Check for more info on my website www.mymonavie.com/laurahandt
2 :
I am a consultant with The Body Shop at Home and love it. You can do as little or as much as you want. I joined to be a stay at home mom and to make some money at the same time. If your interested email me at flaminfortune@yahoo.com
3 :
no
4 :
Telecommuting jobs can be done from home. Hope these job websites can help you. http://www.usejob.com http://hotjobs.yahoo.com http://www.craigslist.org
5 :
don't know about that but you can try this out http://beta.bitwine.com/signup/SP it's free to join
6 :
Sorry to break the bad news - companies like that really don't exist. Check out http://www.realworkathomeinfo.com and read the section on data entry work.
7 :
Hi, you can consider paid survey as a home businesse. Paid surveys are not new, despite all the hoopla. Marketing research firms have been paying consumers to participate in surveys, focus groups and such for some time. But the Web has granted them a more-efficient way to collect data. So, many now conduct legit, online paid surveys and other types of paid, online marketing research. Get more information about paid survey: http://network.sitesled.com/paid-survey.html Good Luck && Best Wishes!
8 :
Hello. I decided to stay home this year and be with my small children. I looked at many different programs, but ended up with one that was actually located 50 miles from where I live, so I was familiar with the company and its reputation, which has been recognized for its high standards and its contributions to the business world. It is not a program for everyone & how quickly you succeed at it is determined by you. I don't sell or track products. I market the company itself & its products & reputation sell themselves. If you would like more information with no obligation, please go to: http://setmefree.team2succeed.com Good luck

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Sunday, November 13, 2011

About How to predict pH of buffer solution - Henderson-hasselbalch equation


How to predict pH of buffer solution - Henderson-hasselbalch equation?
An acetate buffer was prepared by adding 25mL of 1M acetic acid to 3.418g of sodium acetate trihydrate. We are asked to predict the pH of this buffer solution using the Henderson-Hasselbalch equation. I'm not sure how to work out the pKa that we have to find to work out the pH using the equation pH=pKa + log([conj. base]/[acid]) I'd appreciate any help, thanks in advance1
Chemistry - 2 Answers
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pKa = -log Ka the Ka of acetic acid should be on the appendix of your textbook or you can look for it online. pKa of acetate is 4.76 at 25 C.
2 :
moles CH3COONa *3 H2O = 3.418 g/ 136.09 g/mol=0.0251 concentration acetic acid = 0.0251 mol/ 0.025 L= 1.00 M pKa of acetic acid = 4.74 pH = pKa + log [CH3COO-]/ [CH3COOH] = 4.76 + log 1.00 / 1 = 4.74

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Thursday, October 13, 2011

About I am 15 and i need to find a job in Henderson, Nv

I am 15 and i need to find a job in Henderson, Nv?
I am 15 and i really need a job, i can't seem to find one that will hire a 15 year old, most of them you have to be 16. I tried babysitting and it didn't work out. I REALLY need help, can anyone help me? pleasee!
Las Vegas - 7 Answers
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1 :
If you have zaxbys around that area they will hire at 15.
2 :
just go to google and search jobs for nv
3 :
ur 15 u need to have some fun hello 15
4 :
the only place i know that hires is del taco at 15
5 :
You're just going to have to wait until you're 16.
6 :
Contract to water people's gravel front yards.
7 :
usually restaurants will hire 15 year old kids for busing tables, McDonald's or BK or any fast food

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