Name two common techniques used in quantitative analysis.

Titration and chromatography are both widely used techniques in quantitative analysis, making them a strong choice in this context. Titration is a classical method that involves the gradual addition of a reagent to a solution until the desired reaction endpoint is reached, allowing for the precise determination of the concentration of an unknown sample based on a known standard. This technique is particularly useful in acid-base reactions and redox reactions, making it versatile across various applications in analytical chemistry.

Chromatography, on the other hand, utilizes the principles of distribution between a stationary phase and a mobile phase to separate components in a mixture. By measuring the area under the peaks in a chromatogram, quantitative information about the concentration of analytes within the mixture can be obtained. Its ability to analyze complex mixtures is invaluable in both environmental analysis and pharmaceutical applications.

The other techniques mentioned, while useful in various contexts of chemistry, do not focus primarily on the traditional quantitative analysis as effectively as titration and chromatography do. This emphasis on precision, reproducibility, and broad applicability in quantifying compounds confirms the choice of titration and chromatography as key techniques in quantitative analysis.