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A scientist wants to keep the pH of a solution around 5.5. He found three pairs of acids along with their conjugate bases with the

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A scientist wants to keep the pH of a solution around 5.5. He found three pairs of acids along with their conjugate bases with the Ka values as specified. Which acid and its conjugate base is best suited to buffer this solution? A. (i) only B. (ii) only C. (i). (ii), and (iii) are all equally suitable. D. None of these acids are suitable

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