Topic: acidic buffer solution (Read 7240 times)

BaO · « **on:** August 16, 2006, 07:37:02 PM »

which of the following can make a acidic buffer solution ?

A H₂S and NaHS
B NH₃ and NH4Cl
C HNO₃ and some thing,
D somthing and H₃O⁺
i dont remember C and D but they are obviouly wrong, righ?

there are A and B left, i calculated the pH of B , it

$s around 9 or something. so the answer is A but it$ s weird , i got 7.0 for the pH of A which makes the solution neutral.
what`s wrong now

BaO · « **Reply #1 on:** August 16, 2006, 09:28:02 PM »

oh nevermind , i know what's wrong now, the answer should be D , H₃O⁺ and H₂O , or is it?

Borek · « **Reply #2 on:** August 17, 2006, 03:23:29 AM »

Strange question. Some of these solutions can be acidic, but I will not call them buffers in the classic sense.

BaO · « **Reply #3 on:** August 25, 2006, 09:14:01 AM »

Quote from: Borek on August 17, 2006, 03:23:29 AM

Some of these solutions can be acidic

really? so you meant the way i calculated the pH for those solutions was wrong :

Quote

i calculated the pH of B , it $s around 9 or something. so the answer is A but it$ s weird , i got 7.0 for the pH of A

Quote from: Borek on August 17, 2006, 03:23:29 AM

but I will not call them buffers in the classic sense.

why?

Borek · « **Reply #4 on:** August 25, 2006, 11:06:18 AM »

C solution will be acidic for obvious reasons and it will have some buffer capacity. But HNO₃ is too strong to be the buffer in the classic sense (even if it is the weakest of the strong acids).

Topic: acidic buffer solution (Read 7240 times)

BaO

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