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My Chemistry Tutor > Ask Chemistry Homework Questions > High School Chemistry > Calculating the ka value!!!

Calculating the ka value!!!

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Author Topic: Calculating the ka value!!!  (Read 5894 times)
hahahalover
Labrat
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Posts: 1
« 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???
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maddy
Jr. Member
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Posts: 64
« Reply #1 on: June 13, 2007, 10:05:10 PM »
 1
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))
hey
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