Question 17.5: Preparing a Buffer Which acid would you choose to combine wi...

Chemistry: Structure and Properties; Mastering Chemistry

Preparing a Buffer
Which acid would you choose to combine with its sodium salt to make a solution buffered at pH 4.25? For the best choice, calculate the ratio of the conjugate base to the acid required to attain the desired pH.

chlorous acid $(HClO_2)$ $pK_a = 1.95$ formic acid $(HCHO_2)$ $pK_a = 3.74$
nitrous acid $(HNO_2)$ $pK_a = 3.34$ hypochlorous acid (HClO) $pK_a = 7.54$

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