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

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Chemistry

Cacodylic acid (dimethylarsinic acid, HAsO2(CH3)2) is a commonbuffer used in biology to prepare and fix biological samples. ThepKa of cacodylic acid is 6.3.

Part A What is the pH of a buffer solution prepared by mixing20.0 mL of 0.0700 molL−1NaOH with 20.0 mL of 0.170 molL−1 cacodylicacid? Express your answer using one decimal place. pH =

Part B What is the pH of the buffer solution in part A after0.0002 moles of H3O+ was added to the mixture? Express your answerusing one decimal place. pH =

Answer & Explanation Solved by verified expert
3.7 Ratings (583 Votes)
Sol Part A initial moles of HAsO2CH32 Concentration of HAsO2CH32 Volume of HAsO2CH32 1000 0170 20 1000 00034 mol initial moles of NaOH OH    See Answer
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