Acid Bae Titration First Class#174; Information酸碱滴定法第一级# 174；信息.pptVIP

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Acid Bae Titration First Class#174; Information酸碱滴定法第一级# 174；信息.ppt

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AcidBaeTitrationFirstClass

(8.4) Acid-Base Titration What is Titration? Demo Time! The precise addition of a solution in a burette into a measured volume of a sample solution. This allows us to determine the concentration of a specific chemical. The titrant is the solution in a burette during a titration, while the sample is the solution being analyzed. Primary Standard Primary standard is… – a chemical available in a pure and stable form, for which an accurate concentration can be prepared. - then used in a titration to determine the precise concentration of a titrant. The Equivalence Point The equivalence point (stoichiometric point) of a titration is the measured quantity of titrant recorded at the point at which chemically equivalent amounts have reacted. nH+ = nOH- Recall: C = n/V or n = CV The Endpoint The endpoint of a titration is a point in which a sharp change in a measurable and characteristic property occurs (ie. colour change, pH change) The appropriate indicator is selected so that its colour change occurs in the pH range of the equivalence point (see indicator list p609 p804) How To Perform a Titration Standardize titrant by using primary standard. (Often done by teacher!) Measure exact volume of sample and add a couple of drops of indicator. Add the titrant until a colour change occurs. Record amount of titrant added to solution to reach endpoint. pH Indicators-p609 Figure 1 (p595) Titration Curves We plot our experimental data on a graph, with the pH of the solution on the y-axis, and the volume of titrant (ex: NaOH) added on the x-axis. Titration Curves: Strong Acid Strong Base(Figure 2 p599) Titration Curves The midpoint is the sharp increase in pH, which is where the equivalence point is located. For strong acids and bases the equivalence point will occur at a pH of 7. The equivalence point represents the autoionization of water since the conjugate acid of a strong base is weak, and the conjugate base of a strong acid is weak. Neither a strong base o