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More from:Gen Chem Lab I(CHEM 005)
More from:Chemistryby Nallely Salazar hernandez
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Experiment 9 Prelaboratory Assignment A Volumetric Analysis Date Desk No. a. What ts the titrant for this experiment? NaOh (base) , Sedium hydroxide b. Is the indicator generally added to the titrant or the analyte in a titration? indicator, phenolehtalein, 16 added to the analytic, acid. Tt is coloviess in an acid lout pink im basic Solutions. ip. a. What is the primary standard used in this experiment (name and formula)? Define a primary standard. at prim ary Standard BN Accurate mass of Solid Substance whith is Measured , disselved in water, and reacted. AHCgHYOu , PotsEssium Nydroaen elhitnalate b. What is the secondary standard used in this experiment (name and formula)? Define a secondary standard. A secondary standard 1s the standard remaining Solution from ater tne molar concentrat lon of Ane titrant 1S Measured. ts Nadk , Soaium ny dronide Distinguish between a stoichiometric point and an endpoint in an ee I ee yt fe ad anne (Zaction 1S complete When idicdtor changes bacguse amovNt colors due to Ye change: reactants 434 have in oF compined 4. a. When rinsing a buret after cleaning it with soap and water, should the rinse be dispensed through the buret tip or the top opening of the buret? Explain. The water and yinse snovid a0 Ynrouah Ane tp. Saletan will b. Aiseense Ynrouan ana nelp Koco tne or the tranny ane. Same. Experimental Procedure, Part A. In preparing the buret for titration, the final rinse is with the NaOH titrant rather than with deionized water. Explain. The water can alter the Values and Ane 15 hyaroscopic. Part A. Calculate the mass of KHC,H,O, (molar mass 204 that reacts with 15 mL of the 0 NaOH solution prepared in Part A. Express this mass KHC,H,Q, to the correct number of significant figures and record the calculation on the Report Sheet. mL: L DOISL (O) 0 mol Nadk 1 mol KACs Hy Ou : 0 mol NaOH 0 mol WHC, HO, 0 mot KHCgh,O, . 0 Experiment? 139