# BIO SCI 98 Lecture Notes - Lecture 1: Acid Dissociation Constant, Ph

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IMPORTANT EQUATIONS:

The rest of the slides at the beginning of the lecture are simply showing why these equations

work and how they derived them. If you have any questions about them, feel free to post on

the Facebook page.

1.

[C]c[D]d

∆G = ∆G° + RT ln ––––––––

[A]a[B]b

Figure out: When there are non-standard conditions, what is the delta G? And knowing what

the delta G is, we can figure out if the reaction is spontaneous or not.

2.

Keq = e(-∆G°/RT)

Figure out: At equilibrium, we can find out the delta G (naught/zero) with the Keq. And vice

versa.

3.

Figure out: We can solve for pH using the pKa and vice versa. We can also use this to figure out

how much buffer we need to maintain a certain pH

Minor review equations to know:

pH= -log (H+) also pKa = -log (Ka) and

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