Match the correct letter with the correct concept. a- calibration 1. set of physical and chemical operations that allow to identify or quantify a b- control component in a sample C- valuation by displacement 2. organic samples should be stored in containers d- nitrogen stream 3. weak acids or bases that change color in response to a chemical change e- sample 4. ability to exclusively determine the compound of interest without being affected by f- retrograde valuation the presence of other substances g- analyte 5. point where equivalent stoichiometric quantities of analyte and titrant react 6. sample that does not contain the analyte, but with the same matrix as the test h- white i- sampling by criteria j- rotary evaporator sample 7. the titrant concentration cannot be very high because this affects its k- matrix 8. set of all those chemical species that accompany the analyte in the sample I- equivalence point 9. process by which the relationship between the amount of the analyte and the m- sampling signal of the method is established or determined experimentally n- selectivity o- random sampling p- analytical process q- end point r- standardization S- sensitivity t- plastic 10. selection is unbiased and useful when populations are small 11. is used to concentrate a high volume sample 12. process whose objective is that ours collected represents the population under study 13. component of interest 14. titration where a reagent of known concentration is added in excess to the solution containing the analyte and then the reagent is determined the reagent in u- glass excess after its reaction with the analyte with another solution v- chemical indicators