4. What is the pH of a buffer made from 0.42 M H3BO3 and 0.22 M H2BO3-, if the Ka for H3BO3 is 7.3 x 10-10 ? (use 2 decimal places for pH)

General, Organic, and Biological Chemistry
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Author:H. Stephen Stoker
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Chapter10: Acids, Bases, And Salts
Section: Chapter Questions
Problem 10.125EP: What is the pH of a buffer that is 0.150 M in a weak acid and 0.150 M in the acids conjugate base?...
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4. What is the pH of a buffer made from 0.42 M H3BO3 and 0.22 M H2BO3-, if the Ka for H3BOis 7.3 x 10-10 (use 2 decimal places for pH) 

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