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Cacodylic acid (dimethylarsinic acid, HAsO2(CH3)2) is a common buffer used in biology to prepare and fix...

Cacodylic acid (dimethylarsinic acid, HAsO2(CH3)2) is a common buffer used in biology to prepare and fix biological samples. The pKa of cacodylic acid is 6.3. Please show where you are getting your numbers from because I looked at other similar questions but I'm not too sure how they got some of the numbers. Thanks!

Part A: What is the pH of a buffer solution prepared by mixing 20.0 mL of 0.0400 molL−1NaOH with 20.0 mL of 0.140 molL−1 cacodylic acid? Ph = ?

Part B: What is the pH of the buffer solution in part A after 0.0002 moles of H3O+ was added to the mixture? Express your answer using one decimal place. pH = ?

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queen_honey_blossom answered 2 years ago
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