Upload File

ap chem. stoichiometry name lab 3 – gravimetric analysis

  • Home
  • Documents
  • AP Chem. Stoichiometry Name LAB 3 – GRAVIMETRIC ANALYSIS
2
AP Chem. Stoichiometry Name ____________________ LAB 3 – GRAVIMETRIC ANALYSIS In today’s lab you will determine the identity of an unknown calcium halide (CaX 2 ) using a precipitation reaction. By mixing a solution of the calcium halide with excess aqueous sodium carbonate, calcium carbonate can be precipitated, collected, and weighed to determine the identity of the halogen in the original calcium compound. MATERIALS • 2.5 g sodium carbonate • Electronic scale • 2 g unknown calcium halide • Weighing paper • 40 mL water • Side-arm Erlenmeyer + filter paper • Two 100-mL or 150-mL beakers • Plastic Buchner funnel • Stirring rod • Watch glass • Centrifuge • Oven (110 o C to 120 o C) • Small test tubes • Hot plate PRE-LAB 1. Do an internet search for each item below (results from sciencelab.com are fine) and copy the NFPA diamonds for each into your lab notebook. (You do not have to copy it in color.) a. MSDS sodium chloride b. MSDS sodium carbonate c. MSDS calcium carbonate 2. Suppose you react 8.0 g of an unknown calcium halide with excess sodium carbonate to make a calcium carbonate precipitate. You collect 4.0 g of the precipitate. a. Write the balanced net ionic reaction for the reaction that occurs. b. How many moles of calcium carbonate were produced? c. What is the molar mass (in g/mol) of the unknown calcium halide? d. What is the atomic mass & identity of the halogen in the original calcium compound? 3. Read the procedure below and prepare a data table in your notebook for collecting all measurements. PROCEDURE – PART 1 1. Set up a hotplate to a setting of 4. 2. Obtain two small beakers (100-mL and or 150-mL). Add ~2.5 g of sodium carbonate to one beaker and ~2 g of the unknown calcium halide to the other. Record the exact masses in your data table! 3. Dissolve each solid in ~30 mL of water. Use a stirring rod to dissolve each solid in its beaker. 4. Then pour one solution into the other to mix them and cause a precipitation reaction. 5. Place this beaker with the solid precipitate on the warm hot plate for at least two minutes. 6. Meanwhile, set up a filtration apparatus as shown in the picture above. Weigh a piece of filter paper and place it in the funnel. Attach the tubing to the water aspirator, turn on the water to create a vacuum, and wet the filter paper with a small amount of water to make sure the filtration setup works and the filter paper makes a seal. (TIP: Place a medium beaker in the trough below the flowing water to minimize splashing.) 7. Move the beaker off the hotplate and allow it to cool until safe to handle. Then filter the precipitate using the filtration apparatus. 8. Use a spatula or stirring rod to lift the filter paper out of the funnel and place it on a watch glass. Label the watch glass with a small piece of masking tape. Dry the paper in an oven for ~10-15 minutes. Meanwhile start trial 2. 9. Weigh your dried precipitate + filter paper. Then dispose of it in a trash bin. 10. Once you’ve completed two trials, rinse all glassware used in the acid wash bin at the front of the classroom before rinsing them with water and returning them to the cabinet. Be sure to remove any masking tape labels.

Upload: others

Post on 05-Jan-2022

5 views

Category:

Documents


0 download

Report

TRANSCRIPT

Page 1: AP Chem. Stoichiometry Name LAB 3 – GRAVIMETRIC ANALYSIS

APChem. Stoichiometry Name____________________

LAB3–GRAVIMETRICANALYSISIntoday’slabyouwilldeterminetheidentityofanunknowncalciumhalide(CaX2)usingaprecipitationreaction.Bymixingasolutionofthecalciumhalidewithexcessaqueoussodiumcarbonate,calciumcarbonatecanbeprecipitated,collected,andweighedtodeterminetheidentityofthehalogenintheoriginalcalciumcompound.MATERIALS

• 2.5gsodiumcarbonate • Electronicscale• 2gunknowncalciumhalide • Weighingpaper• 40mLwater • Side-armErlenmeyer+filterpaper• Two100-mLor150-mLbeakers • PlasticBuchnerfunnel• Stirringrod • Watchglass• Centrifuge • Oven(110oCto120oC)• Smalltesttubes • Hotplate

PRE-LAB1. Doaninternetsearchforeachitembelow(resultsfromsciencelab.comarefine)andcopytheNFPAdiamondsfor

eachintoyourlabnotebook.(Youdonothavetocopyitincolor.) a. MSDSsodiumchloride b.MSDSsodiumcarbonate c.MSDScalciumcarbonate

2. Supposeyoureact8.0gofanunknowncalciumhalidewithexcesssodiumcarbonatetomakeacalciumcarbonate

precipitate.Youcollect4.0goftheprecipitate.

a. Writethebalancednetionicreactionforthereactionthatoccurs.

b. Howmanymolesofcalciumcarbonatewereproduced?

c. Whatisthemolarmass(ing/mol)oftheunknowncalciumhalide?

d. Whatistheatomicmass&identityofthehalogenintheoriginalcalciumcompound?

3. Readtheprocedurebelowandprepareadatatableinyournotebookforcollectingallmeasurements.

PROCEDURE–PART11. Setupahotplatetoasettingof4.

2. Obtaintwosmallbeakers(100-mLandor150-mL).Add~2.5gofsodiumcarbonatetoonebeakerand~2gofthe

unknowncalciumhalidetotheother.Recordtheexactmassesinyourdatatable!

3. Dissolveeachsolidin~30mLofwater.Useastirringrodtodissolveeachsolidinitsbeaker.

4. Thenpouronesolutionintotheothertomixthemandcauseaprecipitationreaction.

5. Placethisbeakerwiththesolidprecipitateonthewarmhotplateforatleasttwominutes.

6. Meanwhile,setupafiltrationapparatusasshowninthepictureabove.Weighapieceoffilterpaperandplaceitin

thefunnel.Attachthetubingtothewateraspirator,turnonthewatertocreateavacuum,andwetthefilterpaper

withasmallamountofwatertomakesurethefiltrationsetupworksandthefilterpapermakesaseal.(TIP:Place

amediumbeakerinthetroughbelowtheflowingwatertominimizesplashing.)

7. Movethebeakeroffthehotplateandallowittocooluntilsafetohandle.Thenfiltertheprecipitateusingthe

filtrationapparatus.

8. Useaspatulaorstirringrodtoliftthefilterpaperoutofthefunnelandplaceitonawatchglass.Labelthewatch

glasswithasmallpieceofmaskingtape.Drythepaperinanovenfor~10-15minutes.Meanwhilestarttrial2.

9. Weighyourdriedprecipitate+filterpaper.Thendisposeofitinatrashbin.

10. Onceyou’vecompletedtwotrials,rinseallglasswareusedintheacidwashbinatthefrontoftheclassroombefore

rinsingthemwithwaterandreturningthemtothecabinet.Besuretoremoveanymaskingtapelabels.

Page 2: AP Chem. Stoichiometry Name LAB 3 – GRAVIMETRIC ANALYSIS

APChem. Stoichiometry Name____________________

PART1DATATABLE–putthisinyournotebook!

Trial1 Trial2

MassofCaX2(g)

MassofNa2CO3(g)

Massofdryfilterpaper(g)

Massoffilterpaper+CaCO3(s)(g)

PROCEDURE–PART2

1. Obtaintwosmalltesttubesandatesttuberack.Recordthemassofoneofthetesttubes.Useapenciltowrite

thismassontheopaquepartofthetesttube,orlabelitsomeotherway.(Ifthereisalreadyanumberwritten,

modifyitasneeded.)

2. Add~0.25gofsodiumcarbonatetothetesttubewiththemasswrittenonit.Recordtheexactmassofsodium

carbonateyouuse!Dissolveitinwatersothetesttubeis~1/3full.

3. Add~0.2goftheunknowncalciumhalidetotheothertesttube.Recordtheexactmassyouuse!Dissolveitin

watersothetesttubeis~1/3full.

4. Pourthecontentsofonetesttubeintotheothertocauseaprecipitationreaction.Themixtureshouldnowbein

thetesttubewiththerecordedmass.

5. Placethetesttubeinacentrifugeandcentrifugeforatleast2-3minutesseconds.

6. Removethetesttubeanddecantthesupernatantliquid.

7. Washtheprecipitatebyaddingasmallamountofwatertothesametesttube,stirringwithastirringrod,and

centrifugingagainfor90seconds.

8. Removethetesttube,decantthewater,placeitintheovenfor~10minutes,allowittocool,andrecorditsmass.

9. Cleanoutthetesttubeinthesink.Iftimepermits,repeatthisforasecondtrial.

10. Rinseallglasswareusedintheacidwashbinatthefrontoftheclassroombeforerinsingthemwithwaterand

returningthemtothecabinet.Besuretoremoveanymaskingtapelabels.

PART2DATATABLE–putthisinyournotebook!

Trial1 Trial2

MassofCaX2(g)

MassofNa2CO3(g)

Massofemptytesttube(g)

Massoftesttube+CaCO3dried(g)

CALCULATIONS&ANALYSISPart1:Usingthemassofcalciumhalideandthemassofcalciumcarbonatecollected,showthefollowingforeachtrial:

1. Howmanymolesofcalciumcarbonatewereproduced?

2. Whatisthemolarmassoftheunknowncalciumhalide?

3. Whatistheatomicmass&identityofthehalogenintheoriginalcalciumcompound?

Part2:Usingthemassofcalciumhalideandthemassofcalciumcarbonatecollected,showthefollowingforeachtrial:4. Howmanymolesofcalciumcarbonatewereproduced?

5. Whatisthemolarmassoftheunknowncalciumhalide?


Gravimetric Analysis Ppt Chem

Gravimetric Stoichiometry Lab

Stoichiometry is the relationship - Weebly...Chemistry 11 Stoichiometry Notes Key 1 Unit 7 STOICHIOMETRY 1. Introduction to Stoichiometry 2. Mole Mole Stoichiometry 3. Mass Mole Stoichiometry

Stoichiometry By : Caleb Fleming 7 th period chem. 1 honors

Topic 3 - Stoichiometry - Mr. Crosby's Chemistry Pages …lloydcrosby.com/AP Notes/Web - Topic 3 - Stoichiometry.doc · Web viewM2 = = 0.714 M GRAVIMETRIC ANALYSIS A. Definition A

CHAPTER 9 Stoichiometry - Edl · (c) ©Richard Megna/Fundamental Photographs ONLINE Chemistry HMDScience.com ONLINE L ABS include: Stoichiometry and Gravimetric Analysis Stoichiometry

CHEM 1A: GENERAL CHEMISTRYoraola/CHEM1ALECT/Ch. 03/chem1a_ch03...3-1 CHEM 1A: GENERAL CHEMISTRY Chapter 3: Stoichiometry of Formulas and Equations Instructor: Dr. Orlando E. Raola

Gravimetric Stoichiometry Is used to calculate masses of reactants and products in a reaction

Chem 16 - Chem 16 - Stoichiometry of Formulas and EquationsEquations

Gravimetric Methods

UNIT 3 STUDY NOTES CHEMISTRY - A1 Tuition - Unit 3 (Sample).pdf · GRAVIMETRIC ANALYSIS STOICHIOMETRY AND THE GAS LAWS ... Volumetric Flask Used to prepare our primary standard solution

JJC 2008 H2 Chem - Stoichiometry

Ch. 10 – Stoichiometry Stoichiometry – relates molar ...chem.winthrop.edu/faculty/mcintosh/link_to_webpages... · Ch. 10 – Stoichiometry Stoichiometry – relates molar ratios

Gravimetric analysis

Gravimetric Feeder

Gravimetric Stoichiometry

GRAVIMETRIC GATEWAY & ETHERNET COMMUNICATIONS Maguire ...€¦ · GRAVIMETRIC GATEWAY & ETHERNET COMMUNICATIONS Maguire Products, Inc ... Gravimetric Gateway & Ethernet Communications

Problem Set III Stoichiometry - Solutions · Chem 121 Problem set III Solutions - 1 Problem Set III Stoichiometry - Solutions 1. 2. 3. molecular mass of ethane = 2(12.011) + 6(1.008)

Chem e 20050513 final - HKEdCity · “metals and non-metals”, “periodicity”, “mole and stoichiometry”, “acids and bases”, “electrochemistry”, “chemistry of carbon

++++Chem 161-2008 Chapter 3A-Stoichiometry Practiceproblems

Name: Date: Period: CBA REVIEW (Nuclear Chem. Mole Conversions, & Stoichiometry ... ·  · 2015-02-18... (Nuclear Chem. Mole Conversions, & Stoichiometry) NUCLEAR CHEMISTRY:

GENERAL CHEMISTRY Chem. 2010 BATAA EL GAFARY. Stoichiometry Chemical Arithmetic

Gravimetric analysis

CHAPTER 11 Stoichiometry - mr.powner.orgmr.powner.org/textbooks/chem/chapter11.pdf · CHAPTER 11 SECTIONS 1 Defining Stoichiometry 2 Stoichiometric Calculations 3 Limiting Reactants

MGF-ST Series Gravimetric Feeder - Maguiremaguire.com/m/gravimetric-feeder/Gravimetric-Feeder-(MGF).pdf · MGF-ST Series Gravimetric Feeder EliminatE WastE of ... digital control,

chemunlimited.com 1411 Lecture Outline.pdf · NH4Cl + NaOH NaCl . General Chemistry I (Chem 14111Tomball College) Chapter 4: Chemical Stoichiometry ( Formulas, Equations & Solutions

Chapter 4 Aqueous Reactions and Solution Stoichiometry Chem... · 2017-08-16 · Aqueous Reactions and Solution Stoichiometry John D. Bookstaver St. Charles Community College Cottleville,

CHEMISTRY STOICHIOMETRY & COLLOIDS STOICHIOMETRY & COLLOIDS

Table of Contents Stoichiometry Calculations with Molescontent.njctl.org/courses/science/chemistry/stoichiometry/... · · Stoichiometry Calculations with Mass · Mixed Stoichiometry

Chem 103, Section F0F Unit IV - Stoichiometry of Lecture 12 ... · Chem 103, Section F0F Unit IV - Stoichiometry of Formulas and Equations Lecture 12 •Writing and balancing chemical

Chemistry 20 - Unit 4 - Gravimetric Stoichiometry

Composition Stoichiometry A (Chem 16)

Stoichiometry Ideal Stoichiometric Calculations. Stoichiometry Mole – Mole Stoichiometry Conversion

Chapter 1 Introduction · Introduction Analytical Chemistry • qualitative analysis (Chem 101-103) • quantitative analysis. 2 Quantitative Analysis • gravimetric • volumetric

Solution Stoichiometry - mchsapchemistry.com - MCHS Solution Stoichiometry AP Chem ... Unit 2: Chapter 4 - Reactions in Aqueous Solutions ... strong electrolyte, or weak electrolyte