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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.

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
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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Observation Standardization of NaOH Vol of NaOH (ml) 1st Titration (ml) 2nd Titration (ml) 3rd Titration (ml) Initial reading 0.00 0.00 0.00 Final reading 46.50 47.00 47.70 Vol. added XXXXXXXX XXXXXX XXXXXXXX Analysis of unknown acetic acid Vol of NaOH (ml) 1st Titration (ml) 2nd Titration (ml) 3rd Titration (ml) Initial reading 0.00 1.10 2.50 Final reading 1.10 2.50 3.70 Vol. added XXXXXXX. XXXXXXXX XXXXXX 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.
Transcribed Image Text:Observation Standardization of NaOH Vol of NaOH (ml) 1st Titration (ml) 2nd Titration (ml) 3rd Titration (ml) Initial reading 0.00 0.00 0.00 Final reading 46.50 47.00 47.70 Vol. added XXXXXXXX XXXXXX XXXXXXXX Analysis of unknown acetic acid Vol of NaOH (ml) 1st Titration (ml) 2nd Titration (ml) 3rd Titration (ml) Initial reading 0.00 1.10 2.50 Final reading 1.10 2.50 3.70 Vol. added XXXXXXX. XXXXXXXX XXXXXX 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.
Introductlon In 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 primary standard. A standard solution is one whose solute concentration is accurately known. If a solute can be obtained in a very pure, stable, weighable form, a primary standard solution of it can be prepared directly. You will then use the standardized sodium hydroxide solution to determine the acetic acid content of a dilute unknown solution. Procedure (0) Preparation of a Primory Standard Potassium 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 conical flask. Add 75 ml of distilled water. Swirl gently. Cover the flask and leave to dissolve, swirling periodicaly. Cautlon: KHP is not highly soluble and care must be taken to ensure it is all dissolved before you start the titration. (b) Standardisation of 0.1 M NaOH with KHP Rinse and fill the burette with given 0.1 M N2OH. Add three drops of phenolphthalein indicator to the KHP solution in the conical flask. Titrate it with N2OH solution in the burette. The endpoint is the appearence of light pink colour. Note the volume of base required for the titration. Repeat. (c) Analysis of the Unknown Acetic Acid Solution Obtain approximately 30 ml of an acetic acid unknown in a clean beaker. Pipet 10 mL of acetic acid unknown into a clean 250 ml volumetric flask. Add three drops of phenolphthalein indicator to the solution and titrate with standardized NaOH solution in the burette. Record the volume of NaOH required for the titration. Repeat.
Transcribed Image Text:Introductlon In 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 primary standard. A standard solution is one whose solute concentration is accurately known. If a solute can be obtained in a very pure, stable, weighable form, a primary standard solution of it can be prepared directly. You will then use the standardized sodium hydroxide solution to determine the acetic acid content of a dilute unknown solution. Procedure (0) Preparation of a Primory Standard Potassium 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 conical flask. Add 75 ml of distilled water. Swirl gently. Cover the flask and leave to dissolve, swirling periodicaly. Cautlon: KHP is not highly soluble and care must be taken to ensure it is all dissolved before you start the titration. (b) Standardisation of 0.1 M NaOH with KHP Rinse and fill the burette with given 0.1 M N2OH. Add three drops of phenolphthalein indicator to the KHP solution in the conical flask. Titrate it with N2OH solution in the burette. The endpoint is the appearence of light pink colour. Note the volume of base required for the titration. Repeat. (c) Analysis of the Unknown Acetic Acid Solution Obtain approximately 30 ml of an acetic acid unknown in a clean beaker. Pipet 10 mL of acetic acid unknown into a clean 250 ml volumetric flask. Add three drops of phenolphthalein indicator to the solution and titrate with standardized NaOH solution in the burette. Record the volume of NaOH required for the titration. Repeat.
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