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We pay $$$ and it takes seconds! What is the exact molarity of the NaOH solution? 4.Add 4 or 5 drops of phenolphthalein indicator to the flask. By doing the titration and making a plot of the volume of NaOH added versus the resulting pH of the solution, we find that the equivalence point occurs at 0.04398 L of NaOH. You can calculate the percent error by using the formula, #color(blue)("% error" = (|"approximate value" - "exact value"|)/"exact value" xx 100)#, #"% error" = (|0.07878 - 0.100|)/0.100 xx 100 = 21.22%#. Nam lacinia pulvinar tortor, inia pulvinar tortor nec facilisis. Since the indicator reacts with some of the titrant and the indicator may not change at the exact pH of the equivalence point, a small error in introduced in the titration. Required fields are marked *. Donec alique, ultrices ac magna. What I know is due to various errors which tend to happen when conducting an experiment such as contamination of the sample used (impurities) also external factor like temperature and humidity which results the sample to react with the atmosphere (air). Of NaOH (M) 1 20 0 0 28 3 0 0. For Mastery on this assignment, you must Master 10 or more of these questions. Donec aliquet. 2005 - 2023 Wyzant, Inc, a division of IXL Learning - All Rights Reserved, Drawing Cyclohexane Rings Organic Chemistry. Lorem ipsum dolor sit amet, consectetur adipiscing elit. The percent error that has resulted in: 9.03% is by far a significant error that has resulted from a small error in the volume. Nam risus ante, dapibus a mo, tesque dapibus efficitur laoreet. % Uncertainty of (aq) KHP in Volumetric Flask = (0.1/100) x 100. 1 mole of NaOH reacts per mole of KHP, so .00754 mol of NaOH are needed. answer questions 6-11. For Free. eqn. The deviation in the volume, however, is not the only indicator of noticeable systematic errors. save as a .pdf and upload to Gradescope. Lorem ipsum dolor sit amet, consectetur adipiscing elit. To find molarity (concentration = mol/L), convert the 36.78ml of NaOH into L, and divide this into .00278 moles of NaOH J.R. S. stream A sample of 354.5 mg of KHP is added to water, which is then neutralized by x\[s~L& Ng's:;-HT_v@II{^|.dR~|Ud>?.w_W1"^%7Wg1ec? Pelle, cing elit. KHP Titration Lab Report FINAL .pdf - Saikrupa Rajaramsiva The volumes of NaOH used up show significant fluctuations. \[\text{moles acid} = \text{moles base}\nonumber \]. This means that due to systematic error, my accuracy has fallen by 9.03%, which, although not high, is quite a deviation inaccuracy. This water will prevent you from being able to find the exact mass of sodium hydroxide. not need to show your work for additional trials; just populate the table. Cross), Forecasting, Time Series, and Regression (Richard T. O'Connell; Anne B. Koehler), The Methodology of the Social Sciences (Max Weber), Educational Research: Competencies for Analysis and Applications (Gay L. R.; Mills Geoffrey E.; Airasian Peter W.), Introductory College Chemistry I Laboratory (CHEM 1411), Post Lab 4 1411 - Lab Report 4 for CHEM 1411 UVA, Introductory College Chemistry I Laboratory, Web Programming 1 (proctored course) (CS 2205), Art History I OR ART102 Art History II (ART101), Accounting Information Systems (ACCTG 333), Differential Diagnosis & Primary Care Practicum (NR-511), PHIL ethics and social responsibility (PHIL 1404), Managing Business Communications and Change (MGT-325), Fundamentals General, Organic, Biological Chemistry I (CHE 121), Professional Application in Service Learning I (LDR-461), Advanced Anatomy & Physiology for Health Professions (NUR 4904), Principles Of Environmental Science (ENV 100), Operating Systems 2 (proctored course) (CS 3307), Comparative Programming Languages (CS 4402), Business Core Capstone: An Integrated Application (D083), Student-HTN-Atherosclerosis Unfolding Reasoning, Summary Media Now: Understanding Media, Culture, and Technology - chapters 1-12.