Simple Algerbraic Manipulation is Confusing Me

AI Thread Summary
The discussion centers on the confusion surrounding algebraic manipulation in the context of deriving the percentage ionization of weak acids or bases from the Henderson-Hasselbalch equation. The user initially struggles to understand how to rearrange the equation to isolate A-/(AH + A-). They receive guidance to bring A- to the left-hand side, add one to both sides, convert the left-hand side into a single fraction, and then invert the fractions before multiplying by 100. This step-by-step approach ultimately helps the user resolve their confusion. The exchange highlights the importance of clear algebraic manipulation in chemistry problem-solving.
mrlucky0
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I'm working on a chemistry problem and I'm trying to follow the derivation for % ionization (of a weak acid or base) but I can't seem to understand how rearrangement of eq. 6 results in eq. 7.

In more general terms, I started with the Hendreson Hasselbalch equation:

pH = pka + log(A-/AH)

What I want to find is, A-/(AH + A-)

This is giving me a real headache, can anyone help?
 

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Bring the A- to the LHS of (6). Add 1 to both sides and convert the LHS to a single fraction. Invert the fractions and multiply by 100.
 
Thanks, I've got it now.
 
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