101 Ex2 ReportTemplate_2309

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101

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Chemistry

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Feb 20, 2024

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1 Report for Laboratory Exercise #2 Moles, Concentration, Acid-Base Reactions and Quantitative Analysis by Titration 1 Using Microsoft Word, students are to insert responses in all yellow highlighted areas. It is recommended that the report be completed without changing font size, column width, row width, margins and highlights. The completed report must be uploaded to the 101 Brightspace site as a .pdf file by the due date posted on Brightspace. All answers must be the student’s own work without assistance from others. Only reports which are completed using the template will be marked. Name: Lab Section: Quad: Date: Abstract The weight % of acetic acid in a sample of vinegar was determined by titration to be 6.48% using a standardized solution of sodium hydroxide. Data/Results Table 1. Experimental data and calculated values of moles, concentrations for the standardization of NaOH and analysis of CH 3 COOH in vinegar _ Standardization of NaOH Sample 1 Sample 2 Sample 3 KHP (g) 0.501g 0.515g 0.506g Moles KHP 0.00245mol 0.00250moles 0.00248moles NaOH vol (mL) 13.04mL 11.59mL 11.29mL [NaOH] 0.188M 0.216M 0.220M Average [NaOH] 0.218M %RSD for [NaOH] 1.30% Analysis of vinegar sample (5.00 mL) NaOH vol (mL) 19.40mL 19.38mL 19.26mL Moles NaOH 0.000940mol 0.00108mol 0.00110mol Weight % CH 3 COOH 5.59% 6.42% 6.54% %RSD for weight % CH 3 COOH 1.31% Algebraic Equations Do not provide calculations, see page 12 of the lab manual Mole KHP = (volume of KHP solution)*(molarity of KHP solution) [NaOH] = (moles of NaOH)/(volume of NaOH) Moles NaOH added to 5.00mL vinegar solution = (molarity of NaOH)*(volume of vinegar) Weight % CH 3 COOH = (weight of CH3COOH)*(density of vinegar solution)*100

2 Discussion A solution of NaOH was standardised by titration with KHP. The concentration of the prepared NaOH solution was determined to be 0.218 M. This standardised solution of NaOH was used as the titrant to titrate the amount of CH 3 COOH in a sample of vinegar which was determined to be a weight % of 6.48%. The titration ended when the phenolphthalein indicator turned from clear to pink. Conclusions The weight % of CH 3 COOH in the sample of vinegar was 6.48%. References See page 12 for format of references. Vinegar. Edible Chemical Co., Edmonton Alberta A1A 149, Lot# FH8333 Feedback Summary max. Pre-lab quiz: Are all responses correct? 4 Laboratory Notebook: Have all data, observations and procedures been recorded? 1 Report: Are all sections completed correctly and accurately? 3 Participation: Did the student come prepared, was time used well in lab and was student engaged in the experiment? Did the students request the TA to check their drawers for completeness before they left the lab and show the TA their letter of successful submission? 1 Performance evaluation: Did the student follow the safe practice guidelines throughout the whole lab period? 1 Total mark 10 © 2023, Department of Chemistry, Faculty of Science

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