weak acid has a pKa of 7.58. What is the proportion of A- to HA if pH is 9.42?  Round to one decimal place Thank you!

Introductory Chemistry: A Foundation
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Author:Steven S. Zumdahl, Donald J. DeCoste
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Chapter16: Acids And Bases
Section: Chapter Questions
Problem 75AP: 75. A conjugate acid-base pair Consists of two substances related by the donating and accepting of...
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A weak acid has a pKa of 7.58. What is the proportion of A- to HA if pH is 9.42?  Round to one decimal place

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