Problem: Which of the following is a true statement about aqueous solutions containing a buffer?A. a buffer resists pH change caused by adding acid or baseB. the combination of HNO3/NO3- can be used as a bufferC. buffer capacity depends only on its total concentrationD. all buffered solutions have a pH = 7E. none of the above

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We’re being asked to determine which of the following is a true statement about aqueous solutions containing a buffer

Recall that a buffer resists change in pH and can be composed of the following:

weak base and its conjugate acid
weak acid and its conjugate base
weak acid and a strong base 

▪ concentration of weak acid > concentration of strong base

weak base and a strong acid 

concentration of weak base > concentration of strong acid

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Problem Details

Which of the following is a true statement about aqueous solutions containing a buffer?

A. a buffer resists pH change caused by adding acid or base

B. the combination of HNO3/NO3- can be used as a buffer

C. buffer capacity depends only on its total concentration

D. all buffered solutions have a pH = 7

E. none of the above

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