There are two classical methods of chemical analysis that are referred to as “wet” methods. They are called wet methods because they rarely make use of any electronic instrumentation beyond the analytical balance. It should be mentioned that a standardization experiment can be avoided completely if the titrant solute is a primary standard material, and the concentration can thus be known through its preparation. The quantitative determination of an analyte in a solution is the other use for a titration experiment. A titrimetric method that has been used for many years for the determination of nitrogen and/or protein in a sample is the Kjeldahl method. The analysis of water samples for hardness is a common analysis in water and environmental laboratories. In general, wet methods of analysis are used in the modern laboratory in situations in which they are more convenient and/or accurate than instrumental methods and analyte concentrations are so high that instrumental methods are not appropriate.