Which is not a buffer solution...

Which is not a buffer solution

`NH_(4)Cl+NH_(4)OH`

`CH_(3)COOH +CH_(3)COONa`

`CH_(3)COONa`

Borax + Boric acid

Text Solution

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The correct Answer is:

It is not a mixture of weak acid or base and their strong salt.

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A solution capable of maintaining its pH relatively constatn, when either excess acid or excess base is added, is said to be buffered While it is not usually considered a buffered solution, a concentrated solution (10^(-2) M and higher) of a strong acid or stong base is buffered against large changes in pH when acids or bases are added. Buffered solutions are usually those containing a wealk acid and a salt of that weak acid or a weak base and the salt of that weak base. For example a solution containing HAc and NaAC resists large change in pH when acid or alkali is added. For a buffer solution Buiffer capacity is defined as the number of moles of a strong acid or a strong base that causes 1 of the buffer to undergo a 1 unit change in pH. Buffer capacity is maximum when the molar ratio of the two components is unity and the buffer solution is considerred good. Which solution is not a buffer solution ?

Which is a buffer solution?

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