Concordant titres are titration readings that agree closely, usually within about 0.10 cm³, and are averaged to give a reliable result.
Malay: Titer sepadan · Chinese: 一致滴定体积
Concordant titres are burette readings from repeated titrations that agree closely, usually within about 0.10 cm³ of one another, and are the readings you average to get a reliable result. A titration is repeated because a single reading might carry a small error; when two or three titres land within that narrow range, they confirm each other and the average of them is trustworthy.
A worked example shows the selection. Suppose four titrations give 24.50, 23.80, 23.85 and 23.75 cm³. The first, at 24.50, is the rough (trial) titre and is set aside; the other three lie within 0.10 cm³ of each other, so they are concordant. You average only those three: (23.80 + 23.85 + 23.75) ÷ 3 = 23.80 cm³. That averaged titre is the one used in the calculation, not the rough value and not a simple average of all four.
The confusion to avoid is averaging every reading regardless of agreement. Including the rough titre, or a clearly stray result, drags the average off and loses marks. A second slip is thinking “concordant” means “correct”, concordant titres are consistent with each other, which shows good precision, but consistency is not the same as accuracy; a technique with a fixed fault could give concordant but wrong titres. Concordance tells you the readings are repeatable, and repeatability is what the averaging step relies on.
Within this chapter concordant titres are the quality check that makes a titration result dependable, sitting between the end point and the final concentration calculation. Our teachers show you exactly which titres to keep and which to discard so your averaging is defensible.
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