7 Conductivity - .-m;._a..;.w Name Moflem ‘éoilmgd...

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Unformatted text preview: .-m;._a..;.w Name Moflem ‘éoilmgd Section Cpl EXPERIMENT 7 : (a CONDUCTIVITY PRE-LABORATORY QUESTIONS The following preparatory questions should be answered before coming to lab. They are intended to introduce you to several ideas that are important to aspects of the experiment. You must turn in your work to your instructor before you will be allowed to begin the experiment. 1. What is the difference between an electrolyte and a nonelectrolyte? Give one example 0f eaCh type- An filfiifiQNA—fi unfit??? to produce $0.013; 0N6 elecfiri 263131. to}; “a. wad maxim, flue sewer.st de gcfiyfi 97‘: (Eml‘rfi gush as Mam +‘nm M03- + Q}- H T1011 3!: E? ‘2’?» d 065 nm- produce {Ow}; mm mm a ($56“. \seci _ 3 § 9 aim we“: mew; am; ex. E‘l-hmm'k Qzfisfli‘z 2. What is the difference between a strong electrolyte and a weak electrolyte? Give one example of each. F:- s+rcmn3 fleet—mafia com gimme! dissolves; in maize Jest: imp 3h RN03 predéaatm at some}; Pr New electrolxgre dtssomes MN m a 3mm swam. and (A van; Smot§ percem‘r imwizcs. «:3, ,9 ex. Nag-Haze» waif my “come a W“! 3m“ 7"" a“; We” beam-me; i} if ,. Chem1414—Academic Year 2010/2011 7—1 ,/ it” Mn!" 3. Sodium chloride in the solid form does not conduct electricity, but molten sodium chloride does. Explain. mag“, jcwm gm item‘s (we ’"r‘f‘e‘: To more, and *hfiifi‘“ Moves-newt" taxefwif’efi filfifififiafiy' 3“ Aim 503m agfim We {m5 came-t- mwe ems: meme cos 2 ‘ § 5 ‘ r , Nu t.» s . g y etemzmfi/ v 5 4. Are all liquids able to conduct an electric current? Explain. Ni}; :3»: watts} depend an. Wit axial WkGégEWWW mcgggg gnaw}: Luigi have ream écefii‘fifig mwincg inns +m+ am; am; as ems-ingot? m‘hé’ét meta gain, reset 5. Which of the following are expected to be strong electrolytes? a) Acetic acid solution, HC2H3OZ (If fi§C0balt (II) sulfate solution, C0804 ‘ c) Tap water My 7} iii..iAmmonium chloride solution, NH4Cl I, “w”; @Hydrochloric acid, HCl solution Chem1414—Academic Year 2010/2011 Name 153537293=53C>é Section {233; RESULTS PART ONE : CONDUCTIVITY OF SOLID SUBSTANCES Solid Conductor Non-conductor (LED glows) (LED does not glow) Aspirin tablet >5; Carbon . ‘74 Glass X Phosphorus )4; Plastic pg Rubber X Sulfur __P Styrofoam )4 Wood Chromium ‘)( Conger X Lead )4. Tin X PART TWO: CONDUCTIVITY OF PURE LIQUIDS Liquid Conductor Non-conductor (LED glows) (LED does not glow) Deionized water )4 Ethanol T K Isogropanol X Methanol X Tap water K SIGN-OUT: all equipment is put away, and the student bench is clean and dry. TA Date {O 7 Chem14 14-Academic Year 2010/2011 7—7 PART THREE : CONDL CTIVITY OF SOLIDS DISSOLVED IN WATER SAMPLE STRONG WEAK NON- ELECTROLYTE ELECTROLYTE ELECTROLYTE (glows brightly) (glows faintly) (does not glow) V Acetylsalicylic acid 7 Ascorbic acid ‘ ‘; Nitric acid w" a Citric acid X 174 Phosphoric acid Fructose Glucose Sucrose X Potassium hydroxide Sodium hydroxide Potassium chloride“ Potassium sulfate 7 L Sodium iodide %$%xxx Sodium nitrate PART FOUR: CONDUCTIVITY OF IONIC SOLIDS DISSOLVED IN NON-AQUEOUS SOLVENTS SAMPLE STRONG WEAK NON— ELECTROLYTE ELECTROLYTE ELECTROLYTE (glows brightly) (glows faintly) (does not gl_o_w) Potassium chloride K in ethanol " ‘ Potassium chloride in methanol Potassium sulfate in ethanol Potassium sulfate in T I methanol X Sodium nitrate in k ethanol 7‘ Sodium nitrate in methanol Cheml4l4-Academic Year 2010/2011 A Section mg rx R Name POST LABORATORY QUESTIONS 1. a. In Part One, you tested 7 different elements. From their location on the periodic table, which are metals and which are non—metals? 3 ‘. r . x a ,3 Cor 30¢; ?§5<3$§2rs:): 7:3 ; 3 . :“l fiuéésr mt: Linux a as: M Chromium, Lend, toggles“; M35 17m in? mania. b. Which of the substances tested in this part make good electrical insulators (non COHdUCtOTS)? fleeirm, blouse), lymeapngmsa, @0558, ‘Rob‘ocr, sot—9w; fool‘n’a mead, c. What can you conclude about the electrical conductivity of metals vs. non—metals? {their w-fiofifis mafia?” firvieiw (Md MO‘S‘?’ not? Metallic: do f“! 33"?» 2. a. Which of the liquids in Part Two do not contain mobile charge carriers? D: i W. watch ei‘flomol, isuawpmdl, Vie-H1th l _,.«b.‘"’How do you explain the difference in electrical conductivity between deionized water and tap water? .. an , L’ _ r V f V '. , . p: :03; ‘fiQfi. (3‘5‘her 10 H: “thaw mfiqfiair etec’m cry c. Is tap water really a pure liquid? No 3. Acetylsalicylic acid, which you tested in Part Three, is one of the ingredients found in an aspirin tablet, which you also tested in Part One. How do you explain the difference in the ability of these two substances to conduct electricity? 9mm is My: img ccmno‘; break Agree ‘i'o etermmw, I"? dieeo‘wed m wag”??? lT wamcfi conduct, Cheml4l4-Academic Year 2010/20] 1 4. a. Fructose, glucose, and sucrose, which you tested in Part Three, are sugars. The names of sugars always end with the suffix “ -ose “. Do sugars ionize to an appreciable extent when dissolved in water? Mb b. Nitric acid and phosphoric acid are inorganic acids, whereas acetylsalicylic acid, ascorbic acid, and citric acid are organic acids. Do organic acids possess mobile charge carriers when dissolved in water? 19°, 100‘” 5 , 0. Inorganic salts result from the bonding of metals with non-metals. What aqueous inorganic salt solutions did you test in Part Three and what conclusion can you draw about their electrical conductivity? %i‘0§3gi3m as" 7:; godti)m~ iodide, figd‘im ache-fl 51580;.VEC7} fl Nam? git-Egohfed g d. What ions, if any, do each of the following substances produce in aqueous solution? {i}? ,,_,»/~M?c’Eii/anci , CHgOH mi, acid, HCOOH '0 Magnesium sulfate , MgSO4 M + Nitric acid, HNO3 5. Circle each of the following substances that will possess electrical conductivity. i) pentane, C5H12, liquid ii) phosphorous solid , P @hydrofluoric acid, HF, dissolved in water iv) maltose dissolved in water Calcium nitrate, Ca(N03)2, dissolved in water vi) Potassium sulfate, K2804, dissolved in methanol Chem1414-Academic Year 2010/2011 0 A ...
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This note was uploaded on 11/28/2011 for the course CHEM 1414 taught by Professor Slaughter during the Spring '07 term at Oklahoma State.

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7 Conductivity - .-m;._a..;.w Name Moflem ‘éoilmgd...

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