A standard solution is a solution whose concentration is accurately known, used as the reagent in a titration. Because its concentration is known precisely, the amount of substance it delivers can be calculated from its volume. It is usually prepared either from a primary standard of known purity or by standardising against one.

标准溶液是浓度准确已知、用作滴定试剂的溶液。由于其浓度精确已知,可由所用体积算出它提供的物质的量。它通常由已知纯度的基准物质配制,或通过与基准物质标定而得。