For the acetate buffer, the Henderson-Hasselbalch equation is pH = pKa + log([A⁻]/[HA]), so you need the pKa of acetic acid and the concentrations of acetate ion and acetic acid. It seems straightforward in class, but honestly, I keep mixing up the ratio in the log term under exam pressure. My focus is split because I'm calculating the electricity bill for my embroidery machine at home, and those numbers about units and rates feel more urgent and real to me than these concentration ratios.
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