Lorem ipsum dolor sit amet, coce dui lectus, congue vel laoreet ac, dictum vitae odio. [NaOH] = mol/L Calculation for Trial 3 (NaOH) = mol/L Use your two results that are in closest agreement to each other and calculate an average result. and KHP are equal and we used an indicator to find this point. This would have resulted in inaccuracies. That's one problem with abbreviations. The molarity of the KHP solution is determined from the mass and volume of KHP used to prepare the KHP solution. This means that you can calculate its actual molarity by dividing the two - do not forget to convert the volume from milliliters to liters by using the conversion factor, #["NaOH"] = "0.0024973 moles"/(31.70 * 10^(-3)"L") = color(green)(|bar(ul(color(white)(a/a)"0.07878 M"color(white)(a/a)|)))#. Molar mass of KHC8H4O4 Calculation for Trial 1. This is an awesome source of information, Thank you ! Ok,KHP is a monoprotic acid. %
No packages or subscriptions, pay only for the time you need. Solved 2. In a second titration with the same solution of - Chegg The main difference between equivalence and endpoint is that the equivalence point is a point where the chemical reaction comes to an end while the endpoint is the point where the colour change occurs in a system. Only one of the hydrogen atoms in KHP has acidic properties. To check the concentration of NaOH, a chemist must titrate a primary standardin this case, a solution of potassium hydrogen phthalate (KHP). Oliver Twist: Characters, Setting, Style, Audience and Diction, On the Sidewalk, Bleeding: Analysis & Theme, Carolyn Meyers White Lilacs: Summary, Conflict, Analysis, President Ronald Reagans John F. Kennedy Speech: Analysis, Refractive Indices of Water and Oil: Lab Explained, Volume of NaOH added [since the colour change will not happen at, Average Volume of NaOH added in 3 trials (0.1 cm. The expected % uncertainty that was expected was 0.500%, and the uncertainty I obtained was 0.503%. endobj
Get a free answer to a quick problem. tech2 - Vanderbilt University . Choose an expert and meet online. Nam lacinia pulvin, Fusce dui lectus, congue vel laoreet ac, dictum vitae odio. So, you know that at equivalence point, the reaction will consume #0.0024973# moles of #"KHP"# and #0.0024973# moles of #"NaOH"#, since that's what the #1:1# mole ratio tells you. Taking 1.99 grams as supposed to 2.00 grams would have resulted in an inaccuracy of the titration because the percent uncertainty was more when I took 1.99 grams. 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). How do you do acid base neutralization reactions? First you need to write out the balanced equation to determine the mole ratio between C8H5KO4. When the endpoint is reached the addition of titrant should be stopped. Fusce dui lectus, congue vel laoreet ac, dict, ipsum dolor sit amet, consectetur adipiscing elit. 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. Tutor and Freelance Writer. Dont forget those significant digits! Nam lacinia pulvinar tortor nec facilisis. Nam risus ante, dapibus a molestie conse, onec aliquet. <>
10. Fusce dui lectus, congue vel laoreet ac, dictum vitae odio. 2.00 grams was the amount expected to be taken, but the experimental amount was 1.99 grams. Write a correctly balanced equation for the reaction taking place. a) Calculate the concentration of the NaOH solution The primary standard acid to be used is potassium hydrogen phthalate (hereafter referred to as KHP). Chem Q Pack (16-18): moles-->mass, Ka, ox - Quizlet 1.54g of KHP is equivalent to 0.00754 mol of KHP. 1 mole of NaOH reacts per mole of KHP, so .00754 mol of NaOH are needed.. You know how many moles of sodium hydroxide were needed to reach the equivalence point, and the volume of sodium hydroxide solution that delivered that many moles to the reaction. Molarity of NaOH = (mol KHP)/ (V NaOH used for titration): M(NaOH)=0,00213mol0,03103L=0,0688molL . 1. How many Moles of NaOH equals the moles of KHP? - Answers The resultant Acidic solution was transparent, with a small amount of undissolved granules of KHP. Donec aliquet. Nam risus ante, dapibus a molestie consequat, ultrices ac ma, consectetur adipiscing elit. Lorem ipsum dolor, nec facilisis. 2) Determine the number of moles of KPH needed, and convert to grams First, we need to know the number of moles of NaOH we have. around the world. When KHP and NaOH combine, a positive hydrogen ion leaves the KHC8H4O4 and a negative hydrogen atom leaves the NaOH. Finally, divide the moles of \(\ce{H_2SO_4}\) by its volume to get the molarity. We can convert that to grams using its molar mass (180.157 grams per mole) and we get the final grams of 0.305 grams (305mg) of Aspirin present in the solution of 1 dissolved tablet. The number of moles of NaOH is found by multiplying the moles of KHP by the mole ratio of NaOH to KHP given by the above, balanced chemical reaction. KHP can stand for potassium hydrogen phosphate, or more likely in this case, it stands for potassium hydrogen phthalate (a monoprotic acid). Legal. The percentage uncertainty calculated of the concentration of NaOH was 2.57%, which indicates that the level of precision, although not low, could have been better. The volume of \(\ce{H_2SO_4}\) required is smaller than the volume of \(\ce{NaOH}\) because of the two hydrogen ions contributed by each molecule. 2 0 obj
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