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Which of the following mixtures would NOT be described as a buffer solution?

Chemistry
Tutor: None Selected Time limit: 0 Hours

0.20 M NaOH and 0.40 M CH3COOH

0.25 M HNO3 and 0.15 M KNO3
0.25 M HNO2 and 0.15 M KNO2
0.15 M NH4Cl and 0.25 M NH3
0.30 M NH3 and 0.15 M HCl

I am stuck on Homework please help due in 15 minutes. 
Mar 7th, 2015

 NH3 and 0.15 M HCl

In a buffer solution there are must salt present as well, and this choice is not the case

Mar 7th, 2015

Thats wrong, I lost a point :( 

Mar 8th, 2015

I just realized why - your main 'head' question is 'which of the following.... NOT be described as a buffer solution'

Then, you have '0.20 M NaOH and 0.40 M CH3COOH' right before choices - this must be connected to another question. I answered to the 'buffer' related question. But question was probably asking something about the strength of acid and the base that is equivalent to  '0.20 M NaOH and 0.40 M CH3COOH'

So, there are 2 different questions are involved - next time, please, don't confuse tutors with the head question. It's important. 

Mar 8th, 2015

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