Need help calculating the initial ph of HF (weak acid). The Ka = (6.6x10^-4). I managed to calculate the Pka which equals 4.74. How do i use that to find the inital ph?

Chemistry: Principles and Practice
3rd Edition
ISBN:9780534420123
Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Chapter4: Chemical Reactions In Solution
Section: Chapter Questions
Problem 4.91QE
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Need help calculating the initial ph of HF (weak acid). The Ka = (6.6x10^-4). I managed to calculate the Pka which equals 4.74. How do i use that to find the inital ph?

Two 25.0 mL samples, one 0.100 M
hydrochloric acid and the other
0.100 M hydrofluoric acid, were
titrated with 0.200 M potassium
hydroxide.
Transcribed Image Text:Two 25.0 mL samples, one 0.100 M hydrochloric acid and the other 0.100 M hydrofluoric acid, were titrated with 0.200 M potassium hydroxide.
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