My Chemistry Tutor
March 14, 2010, 07:53:48 AM *
Welcome, Guest. Please login or register.
Did you miss your activation email?

Login with username, password and session length
Unlimited Game Rentals Delivered - Free Trial
News:
 
   Home   Help Search GoogleTagged Login Register  


Pages: [1]
« previous next »
  Print  
Author Topic: Calculating the ka value!!!  (Read 4275 times)
hahahalover
Labrat
*
Posts: 1


View Profile
« on: June 13, 2007, 04:08:45 PM »
The question is: A solution of HBr contains 2 g of HBr per litre and has a pH of 2.5. What is the Ka and the PoH?

My chem teacher never taught us this and the exam is in 2 day. How do u find the Ka???
Logged
maddy
Jr. Member
**
Posts: 64


View Profile
« Reply #1 on: June 13, 2007, 10:05:10 PM »
pOH = 14 - 2.5

Ka = [H+]*[Br-]/[HBr]

From the pH you can get [H+] by 10^-2.5.  This is the same concentration as Br- because it is a 1:1 ratio

Convert grams of HBr into moles of HBr to get the denominator. (2/(1.00794+79.9))
Logged
Pages: [1]
  Print  

« previous next »
 
Jump to:  

* Share this topic...
In a forum
(BBCode)
In a site/blog
(HTML)

Powered by MySQL Powered by PHP Powered by SMF 1.1.11 | SMF © 2006-2009, Simple Machines LLC Valid XHTML 1.0! Valid CSS!