ObservationStandardization of NaOHVol of NaOH (ml)1st Titration (ml)2nd Titration (ml)3rd Titration (ml)Initial reading0.000.000.00Final reading46.5047.0047.70Vol. addedXXXXXXXXXXXXXXXXXXXXXXAnalysis of unknown acetic acidVol of NaOH (ml)1st Titration (ml)2nd Titration (ml)3rd Titration (ml)Initial reading0.001.102.50Final reading1.102.503.70Vol. addedXXXXXXX.XXXXXXXXXXXXXX1. Determine the concentration of NaOH2. Detremine the concentration of acetic acid3. Calculate the number of moles of KHP4. Compare the average volume for NaOH and Acetic acetic acid at 90% CL. IntroductlonIn Part (a) of this experiment you will prepare a primary standard. Potassium hydrogen phthalate(KHP) is a monoprotic acid with the formula KHC,H.O. In this experiment KHP is used as the primarystandard. A standard solution is one whose solute concentration is accurately known. If a solute canbe obtained in a very pure, stable, weighable form, a primary standard solution of it can beprepared directly. You will then use the standardized sodium hydroxide solution to determine theacetic acid content of a dilute unknown solution.Procedure(0) Preparation of a Primory StandardPotassium hydrogen phthalate (KHP) is a primary standard. Weigh accurately by difference,approximately 0.8 g of KHP in a clean, dry weighing bottle and transfer it into a 250 ml conicalflask. Add 75 ml of distilled water. Swirl gently. Cover the flask and leave to dissolve, swirlingperiodicaly. Cautlon: KHP is not highly soluble and care must be taken to ensure it is alldissolved before you start the titration.(b) Standardisation of 0.1 M NaOH with KHPRinse and fill the burette with given 0.1 M N2OH. Add three drops of phenolphthalein indicatorto the KHP solution in the conical flask. Titrate it with N2OH solution in the burette. Theendpoint is the appearence of light pink colour. Note the volume of base required for thetitration. Repeat.(c) Analysis of the Unknown Acetic Acid SolutionObtain approximately 30 ml of an acetic acid unknown in a clean beaker. Pipet 10 mL of aceticacid unknown into a clean 250 ml volumetric flask. Add three drops of phenolphthaleinindicator to the solution and titrate with standardized NaOH solution in the burette. Record thevolume of NaOH required for the titration. Repeat.

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Answered: 1. Determine the concentration of NaOH…

1. Determine the concentration of NaOH 2. Detremine the concentration of acetic acid 3. Calculate the number of moles of KHP 4. Compare the average volume for NaOH and Acetic acetic acid at 90% CL.

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter4: Energy And Chemical Reactions

Section: Chapter Questions

Problem 120QRT

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