QUANTITATIVE CHEMICAL ANALYSIS TEST 2024

In the 18th century, the strength (actually the concentration) of _____ samples was determined by noting the amount of potassium carbonate, K₂CO₃, which had to be added, a little at a time, before bubbling ceased. The greater the weight of potassium carbonate added to reach the point where the bubbling ended, the more concentrated the _______. Vinegar, vinegar The test for vinegar concentration: acetic acid reacts with potassium carbonate according to the following equation: 2CH₃CO₂H(aq) + K₂CO₃(s) → KCH₃CO(aq) + CO₂(g) + H₂O(l) The bubbling is due to the production of CO₂. The test of vinegar concentration with potassium carbonate is a type of ________- the determination of the amount or concentration of a substance in a sample. Quantitative analysis Quantitative analysis is the determination of the amount or ______ of a substance in a sample. Concentration _____ is a quantitative chemical analysis method that involves measuring the volume of a reactant solution required to completely react with the analyte in a sample. Titration A device used for the precise delivery of variable liquid volumes, such as in a titration analysis is a: Buret A _______ is a graduated glass tube with a tap at one end, for delivering known volumes of a liquid, especially in titrations. Buret The word "buret" translates as: "stomach jug" A typical titration analysis involves the use of a buret to make incremental additions of a solution containing a known concentration of some substance (the _____) to a sample solution containing the substance whose concentration is to be measured (the analyte). Titrant A typical titration analysis involves the use of a buret to make incremental additions of a solution containing a known concentration of some substance (the titrant) to a sample solution containing the substance whose concentration is to be measured (the ______). Analyte In a quantitative analysis, the _____ is the chemical species of interest. Analyte A ______ is the solution containing a known concentration of substance that will react with the analyte in a titration analysis. Titrant In a titration analysis, the titrant and analyte undergo a chemical reaction of known stoichiometry, and so measuring the volume of the titrant solution required for complete reaction with the analyte (the _______ of the titration) allows calculation of the analyte concentration. Equivalence point The ______ is the volume of titrant required to react completely with the analyte in a titration analysis. Equivalence point The equivalence point of a titration may be detected visually if a distinct change in the appearance of the sample solution accompanies the