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13. How would you prepare 100 ml of 0.1 M buffer (pH 4:5) from acetic acid (pK = 4.7) using 0.1 M HCl or 0.1

13. How would you prepare 100 ml of 0.1 M buffer (pH 4:5) from acetic acid (pK = 4.7) using 0.1 M HCl or 0.1 M NaOH? 14. What is the isoelectric point of histidine? (PK, = 1.8; PK = 6.0; pK = 9.20)

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