CHEM 142 ZOLLER L_2

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< Zolley Chem (47 wme: ENY )Y WICCHES S Fall 2008 CheM |42 L o\ Lab Partner: \/efi JUlt EXP 1: Physical Meéasurements and Error Analysis Grading WebAssign prelab: 5 pts This template: 30 pts Lab Notebook Duplicate: & pts By signing below, you certify that you have not falsified data and that you have not plagiarized any part of this lab report. Failure to sign this declaration will cost you 5 points. Signature: %)/\_'/\, Purpose and Method Things to think about: What is the goa! of this experiment? Explain how it is accomplished. What is the gensral method (not step by step detailed procedure) that you will be using to achieve this goal? How will you process the datal that you record in lab? (What calculations will you use and how do you obtain all of the values to plug into those equations?) (& fl?intS) 'The goal of this experiment is to determine the accuracy of measurement using three tools for measuring the voiume of water: graduated gylinder, buret, and-pipet. We will use each type of glassware to measure and deliver 10mL of water into a vial, and proceed to weigh and record the mass of the samples. This procedure will be repeated several times, and mass data that is gained will be used to calculate the volume of the water delivered, average volume of water delivered, and standard deviation of measurements, Secondly, we will prepare a sucrose solution that is 25%.sucrosa by weight. We will use our most precise measuring device to caiculate the density of our solution {using the mass we measure and volume we of water we determine to use) and then compare it to the known density value to then determine the accuracy of the buret. In conclusion, we will calcuate the volume of a sample of mystery.metal.using a gradualted cylinder and measuring the inital volume of the water and subtracting it from the volume after the metal was added. We will use these values along with the mass of the sample to compare to other known values and determine what metal it most closely resembled. For each part of the experiment we will use the data we measure to find t@m _standard deviatiors of our measurements, thus determining the accuracy of each measurement tool. DATA AND CALCULATIONS Note: Not reporting all of your Part A data in the tables provided 1. Determination of uncertainty in graduated cylinder volume may result in the loss of up to Room temp 20/°C 0.5 pt Density of water at RT 0.9982|g/mL 0.5pt Run 1 Run 2 Run 3 Run 4 Run & Mass of vial + cap (g) 28.107 28.030 28.083 28.085] 28.044 Mass of vial + cap + water () 38.578 38.469 38.449 38.596 38.462 Mass of water delivered (g) 10.489 10.439 10.366 10.531 10.418 Volume of water delivered (mL) 10.488 10.458 10.385 10.58 10.437 Average volume of water delivered 10.464(mL g 0 l{ P Standard deviation of measurements 0.061|mL Provide sample caiculations for determining the volume of water from the mass of water, the average volume delivered, and the T 3 -39 volvme of water: laverage volvme: ! standird jo.44 \2 5l 10-464 4 HzO(il'\,L | \]('fo?} ( standard deviation of your measurements. These may be neatly handwritten. (2 pts each = 6 pt? L eviation: fo.¢5 \- Cjodt )t h 44 -10.43)* 1(10-49 +10.9 *10.39 + | - “999Lg 0 )1 10511099 | >+{_,W , l I [ 1098 ml | 2104569 ML ! { -t 0bmb Il 5@ P {,‘/, b (%7
II. Determination of uncertainty in buret volume Run 1 Run 2 Run 3 Run 4 Run 5 Mass of vial + cap (g) 28.073 28.031 28.072 28.107| 28.057 Mass of vial + cap + water () 37.758 38.003 38.057 38.057 37.987 Mass of water delivered (g) 9.685 9.972 9.985 9.950 9.930| Volume of water delivered (mL) 9.702 9,990 10.003 0.968 9.947 Average volume of water delivered 9.922|mL 0.5 pt Standard deviation of measurements 0.125|mL 0.5 pt 111, Determination of uncertainty in pipet volume Run 1 Run 2 Run 3 Run 4 Run 5 Mass of vial + cap (g) 28.037 28.085 28.069 28.082] 28.078 Mass of vial + cap + water (g) 37.982 37.991 38.03 38.047 38.016 Mass of water delivered (g) 9,945 9.926 9.961 9.965 9.938 Volume of water delivered (mL) 9.963 0.944 9.979 9.983 9.956 Average volume of water delivered 9.965|mL 0.5 pt Standard deviation of measurements 0.0145|mL 0.5 pt Which type of glassware provides the best precision? Explain your reasoning and include the evidence you have for your decision. (2 pts) We found that the pipet was the type of glassware that provides the best precigicion. We determined this because our average volume of water delivered was 9.985mL, closest to the desired 10mL. We verified this result when we calculated the standard deviation of our data and found that it was the closest to 0, meaning that the pipet indeed was the most precise piece of glassware used for measuring. {V. Determination of accuracy of density measurement Mass of empty beaker (g) 184.469 Mass of beaker + sucrose (g) 180.874 Mass of sucrose (g) 16.405 Volume of water to add (mL} 49.215 Mass of beaker + sucrose + water (g) 228.872 Actual % sucrose by weight 255 Show your calculations for the (a) volume of water to add to prepare a 25% sucrose solution based on the mass of sucrose in your beaker and (b) the actual % sucrose in the solution you prepared. These may be neatly handwritten. (2 pts each = 4 pts) 0) 1b-405g sveras 1) 220.9%29 ¢ma’t beaker +JoIn . 4 I~ 190.9%49 & mass beq.er revorose wo/. of fveroge | ——— ] ,fiigzg;‘ +H<O sevtion ‘ ‘H»“]‘i%j e mars of water | f | 1 tlo ‘fi‘OSj © ase of Jvarofe ‘:’.quzs]jgmLH 0 v4.403 9 e mafl fvaofe rwvatey so/n : 99 2 1u.4osq"/e‘a. 034 = 2647 x |00 = 2$.907 Run 1 Run 2 Run 3* “Run 3 only needs to be Mass of vial + cap (g) 26.043] _26.108 N/ perfarmed if the densities Mass of vial + cap + sucrose solution (g) 39.521 30.474] N/A calculated from runs 1 and 2 are Mass of sucrose solution delivered (g) 11.478 11.368] N/A more than 0.01 g/mL apart. Density of sucrose solution (g/mL) 1.15] 114§ /A Average density of sucrose solution aE|gimL 0.5 pt Density of sucrose sofution from table of actual % sucrose and densities 1.0835{g/mL 0.5 pt y [ e
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