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posted by  SeminoleFan81 on 7/2/2007 6:48:42 PM  |  status: Live  

Buffer

Course Textbook Chapter Problem
General Chemistry Chemistry (8th) by Chang N/A N/A
Question Details:
  Which one of the following is a buffer solution?
 
a) 0.40 M HCN and 0.10 KCN
b) 0.20 M CH3COOH
c) 1.0 M HNO3 and 1.0 1.0  NaNO3
d) 0.10 M KCN
e) 0.50 M HCl and 0.10 NaCl

 
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posted by Babie Doll on 7/2/2007 10:50:06 PM  |  status: Live
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SeminoleFan81's comment:
"Thanks!"
Response Details:

A) 0.40 M HCN and 0.10 KCN

a is the answer because c and e shows that HNO3 and HCl are strong acids, b and d are eliminated because theres no second compound...so the answer is A.    As seen below is the definition of a buffer solution:

buffer solution: a mixture of a weak acid or weak base and its salt
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posted by set on 7/4/2007 5:46:39 PM  |  status: Live
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Response Details:
A buffer consists of a weak acid and base
 
b.) and d.) are not right because they only consist of one chemical! we need two
 
c.) has HNO3 as one of the chemicals. this is a strong acid, so this answer isnt correct.
 
e.) also has a strong acid, HCL, so this also is not the correct answer.

Therfore, the answer is A!

I hope this helps!
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