First, subtract your initial burette reading from the final reading to get the titre volume, ensuring you record both to the nearest 0.05 cm³ for four significant figures. Remember, the concentration calculation itself comes from (acid M × acid V) / alkali V, using your average concordant titre.
But I always double-check my subtraction against the physical meniscus—my grandfather was a pharmacist, and his worn brass weights taught me that precise tools can still be misread by a tired eye in the lamplight.
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