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b. You have 100 mLs of a 2 M histidine solution at pH 6.0, how many ml.s of a 5 M KOH solution must be added to bring the pH to exactly 7.0? Report your answer to 1 decimal point - assume no change in volume

b. You have 100 mLs of a 2 M histidine solution at pH 6.0, how many ml.s of a 5 M KOH solution must be added to bring the pH to exactly 7.0? Report your answer to 1 decimal point - assume no change in volume

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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b. You have 100 mLs of a 2 M histidine solution at pH 6.0, how many ml.s of a 5 M KOH solution must be added to bring the pH to exactly 7.0? Report your answer to 1 decimal point - assume no change in volume
Transcribed Image Text:b. You have 100 mLs of a 2 M histidine solution at pH 6.0, how many ml.s of a 5 M KOH solution must be added to bring the pH to exactly 7.0? Report your answer to 1 decimal point - assume no change in volume
Expert Solution
Step 1

Histidine(His) is an amino acid with a side group(=NH+) whose pKa = 6.0 

Since the initial pH = pKa, the solution has an equal concentration of weak acid, HisH+(aq), and conjugate base, His(aq). 

 

 

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