What is the net charge on the side chain of tyrosine at pH 9? (pKa value is 10)

Introduction to General, Organic and Biochemistry
11th Edition
ISBN:9781285869759
Author:Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar Torres
Publisher:Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar Torres
Chapter31: Immunochemistry
Section: Chapter Questions
Problem 31.17P: When a foreign substance is injected in a rabbit, how long does it take to find antibodies against...
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What is the net charge on the side chain of tyrosine at pH 9? (pKa value is 10)

 

Answer Given: -0.1

 

I don't understand why

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i still don't understand why and the solution provided is incorrect. Could someone write it out step by step with the henderson-hasselbach equation to give the final answer of -0.1?

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