Ah, first you use pH = -log[H⁺], but for weak acid, [H⁺] = √(Ka × C). The approximation is that you ignore the 'x' subtracted from initial concentration, yaar. Just make sure Ka is small, around 10^-5 types.
Actually, I learned this by calculating malic acid levels in my apples last autumn—same math, but the result told me if they'd be sweet or sour for market. Theory feels different when your orchard depends on it.
#education#class
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