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UCM CHEM 002-01 - lab report 7

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Dolores RamirezExperiment #7 – Inorganic Synthesis and Nomenclature: Precipitation of Ancient Mineral PigmentsDolores RamirezChem 2 Lab 2LoganApril 7, 2013Experiment #7 – Inorganic Synthesis and Nomenclature:Precipitation of Ancient Mineral Pigments1. Introduction: The purpose of this lab is to successfully characterize organic, ionic compounds as soluble or insoluble. We also have assess a set of solubility rules and a system of nomenclature for combinations of commonly encountered ions. Then we have to predict formulae of precipitates based on observations of reactions. Lastly we write a balanced, net ionic equations to describe precipitations reactions.2. Experimental:a) Materials:Chemicals: Dropper bottles (1set per lab bench) containing 0.5 M aqueous solutions of the following: silver nitrate [AgNO3], sodium iodide [NaI], sodium chloride [NaCl], Cobalt (II) CHLORIDE [CoCL2], sodium phosphate [Na3PO4], nickel (II) chloride [NiCl2], sodiumcarbonate [Na2CO3], cadmium (II) nitrate[CD(NO3)2], sodium sulfide [Na2S], copper (II) chloride [CuCL2], sodium orthosilicate [Na4SiO4], barium chloride [BaCl2], potassium sulfate [K2SO4], lead (II) nitrate [Pb(NO3)2], potassium chromate [K2CrO4], iron (II) chloride [FeCL2], potassium ferricyanide [K3Fe(CN)6], iron (III) chloride [FeCl3}, sodium hydroxide [NaOH], iron (II) sulfate [FeSO4], potassium oxalate [K2C2O4], copper (II) sulfate [CuSO4], tin (IV) chloride [SnCl4], chromium (III) nitrate [Cr(NO3)3], potassium dichromate [K2Cr2O7], zinc nitrate [Zn(NO3)2], and sodium dimethylglyoximate [NaC4H7N2O2]. Additional reagent: 6 M ammonia.b) Apparatus:Printed sample grids with plastic coversheets; wooden toothpicks; Kim wipes.c) Procedure: 1. Follow the name of the pigment to be produce. The formulas for the pairs of reagents to be combined are given on the lab report pages.2. After each reaction has been observed, write net ionic that describes reaction.3. Mix indicated reagents on the pigment sample grid, one pair of reagents per box in the grid. Add small quantities: 20 to 4 drops of each reagent will usually suffice.4. Be careful not to contaminate droppers. ( inserting the dropper tip into your test tubes during the delivery process; tipping the dropper upside 1down exposing the solution to the rubber bulb atop the dropper, which may not be clean)5. After each reaction is complete, observe the results closely and record a description of what you see.6. If you think a reaction has occurred, indicate why this is.7. Then, write a net ionic equation for the reaction.8. Remember that a net equation shows reactants that are actually present in significant concentration before the reaction and which disappeared during the reaction and products that were formed in significant concentration during the reaction.9. Remember that ions have charges and in balanced equations both the atoms and overall charge must be balanced.10. Beneath each chemical species write the name according to the rules of ionic compounds.11. When writing observations use the word “colorless” for “clear.” The opposite of clear is cloudy, turbid or “milky.” The opposite of colored is colorless. All solutions are clear; some are clear and colorless while others are cleart and colored (blue, yellow, etc.).3. Results and Discussion:All results to this experiment are found on pages 3-7. The names of the solutions being used including their chemical equations. You can also find the result to the chemical reactions between each chemical and the balanced equation for precipitation.4. Conclusion:As conclusion this experiment was successful. We were able to successfully characterize organic, ionic compounds as soluble or insoluble. We also have assess a set of solubility rules and a system of nomenclature for combinations of commonly encountered ions. Then we have to predict formulae of precipitates based on observations of reactions. Lastly we write a balanced, net ionic equations to describe precipitations reactionsa) Initialed Duplicate Laboratory Notebook Page(s):i. The initialed duplicate laboratory notebook page(s) must be included after your conclusion upon report submission.5. Report


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