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일반화학실험1-일상생활에서의 산과 염기분석(Analysis of Acid and Base in Life), 영어로 작성된 레포트로 실험이론 실험방법 실험결과 및 고찰에 대해 서술하고 있습니다. 이 실험은 아스피린과 식초의 농도를 알아내는 실험으로 각각의 용액을 염기성 용액과 반응시키고 페놀프탈레인을 이용하여 중화점을 찾아냅니다. 평가B괜찮아요

1. Experiment Purpose- Find out the concentration of acid or base by neutralization- Learn what is the Acid, Base, Neutralization, pH, Indicator, Equivalence point, End point and Back titration.2. Experiment Theory➀ Acid – BaseArrhenius Acid – BaseAcid :Substance that ionization in water and put out proton (H)Base :Substance that ionization in water and put out hydroxide(OH-)Brønsted – Lowry Acid – BaseAcid : Proton donorBase : Proton acceptorLewis Acid – BaseAcid : Non-bonding electron acceptorBase : Non-bonding electron donor

자연과학| 2020.01.08| 8페이지| 1,000원| 조회(293)

아스피린, 일반화학실험, 식초, Aspirin, 화학실험, 산과염기, vinegar, acid and base

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일반화학실험1-질산칼륨의 용해도(Solubility of potassium nitrate),영어로 작성된 레포트로 실험이론,실험방법,실험결과 및 고찰에 대해 서술하고 있습니다. 실험A에서는 질산칼륨의 온도에 따른 용해도곡선을 구합니다. 실험B에서는 질산칼륨을 다른 미지의 물질이 섞인 용액에서 분리하고, 깁스의 법칙(G=H-TS)를 이용하여 H와 S값을 구한

1. Experiment PurposeUnderstanding the solubility of potassium nitrate and chemical equilibrium. In addition we will try to understanding relation among equilibrium constant and thermodynamic values.* Key concept- Chemical equilibrium- Solubility2. Experiment Theory1) Chemical equilibriumchemical equilibrium is the state in which both reactants and products are present in concentrations which have no tendency to change. Because at this state the speed of forward reaction andbackward reactions are equal.

자연과학| 2020.01.08| 8페이지| 1,000원| 조회(442)

용해도, 일반화학실험, 화학실험, 질산칼륨, 용해도곡선, Solubility, Po..

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일반화학실험1-크로마토그래피(Chromatography), 영어로 작성된 레포트로 실험이론, 실험방법,실험결과 및 고찰에 대해 서술하고 있습니다. 실험은 정상크로마토그래 방법을 이용하여 색소를 분리하고, 극성물질의 상관관계를 이해하는 실험입니다

1. Experiment Purpose- Learning the basic principle of chromatography- Understanding the relation between the polarity of matter and the separation of pigments using normal chromatography2. Experiment TheoryChromatography is a physical method of separation in which the components to be separated are distributed between two phases, one of which is stantionary (called the stationary phase) while the other (called the mobile phase) moves in a definite direction.Stationary Phase: The substance is fixed for the chromatography procedure.

자연과학| 2020.01.08| 4페이지| 1,000원| 조회(283)

크로마토그래피, Chromatography, 일반화학실험, 화학실험, 정상 크로..

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일반화학실험-아보가드로 수의 결정(Determining of Avogadro's number), 영어로 작성된 레포트로 실험이론, 실험방법, 실험결과 및 고찰에 대해 서술하고 있습니다. 아보가드로 수를 구하기 위해 물에 스테아르산을 첨가하여 인지질 단일층을 만들고,그 단일층의 두께를 탄소갯수만큼 나눠 탄소원소 1개당 부피 및 아보가드로수를 구한다

1. purposeTo derive Avogadro's number (the number of molecules in a mole of a substance), using an oil layer on water. 2. Theory 1) Avogardo's Number The definition of Avogadro’s number is units in one mole of any substance (defined as its molecular weight in grams), equal to (6.022140857×1023) The units may be electrons, atoms, ions, molecules, depending on the nature of the substance and the character of the reaction. < 중 략 >3. Apparatus and ReagentApparatus - Large water bowl, Pipette with pipette bulb, Glass rod, Graduated cylinder, Beaker, Balance, Spatula, RulerReagent – distilled water, hexane, stearic acid4. Experiment Procedure◇ Procedure A – Calibration of pipette 1) Wash a pipette with hexane several times and fill the pipette with hexane. 2) Measure the number of drops of 1mL hexane.◇ Procedure B – Measure the diameter of monolayer 1) Fill a large bowl half way with water and wait until the water surface is smooth.

자연과학| 2020.01.08| 7페이지| 1,000원| 조회(326)

일반화학실험, 일반화학, 화학실험, 아보가드로수, Avogadro, 스테아르산, a..

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일반화학실험1- 탄산염의 분석(Analysis of carbonate salt)-영어로 작성된 레포트로 실험이론, 실험방법, 실험결과 및 고찰에 대해 서술하고 있습니다. 맨 첫장에는 한국말로 실험에 대해 간단히 설명하고 있으며, 실험에서 고려해야 할 중요한 요점을 알려줍니다

ReportAnalysis of carbonate saltM _{2} CO _{3} +HCl`` -> ``2M ^{+} `+`2Cl ^{-} +`H _{2} O+`CO _{2}uparrow 일정성분비의 법칙에 따라 1몰의M _{2} CO _{3}가 산과 반응하면, 1몰의 이산화탄소가 생성된다. 따라서 0.3g의M _{2} CO _{3}를 반응시키고, M이 무엇인지 알고 싶다면 몇 몰의 이산화탄소가 생성되는지 확인하면 된다.플라스크 안에서M _{2} CO _{3}와 HCl을 반응시키면 이산화탄소가 생성되고, 뷰렛의 눈금이 변하게 된다.나의 실험에서는 뷰렛의 눈높이가 약 4.9ml정도 변했고 4.9ml를 표준상태에서의 기체 1몰의 부피인 22.4L로 나누면 0.000203몰이 된다.0.000203몰의 이산화탄소가 생성되었으므로 반응한M _{2} CO _{3}도 0.000203몰이다. 0.3g의M _{2} CO _{3}가 0.000203몰이므로 M은 ...이다.실제실험에서 실험실의 온도는 표준상태(25도)가 아니므로 PV=nRT를 이용하여 1몰의 기체V를 구한다,실험할 때 손에 들고 있는 비커와 뷰렛의 용액높이를 반응이 진행되는 내내똑같이 유지하는게 매우 중요하다. 그 이유는 용액이 높이차가 커져버리면 용액의 높이차만큼 압력이 차이가 나게 되고, 이는 생성된 이산화탄소의 양을 측정하는데 큰 영향을 미친다.Analysis of carbonate salt1.Experiment PurposeDetermine the type of carbonate by measuring the amount of carbon dioxide produced by reacting it with hydrochloric acid.2. Experiment TheoryThere are 3types of carbonate salt: normal salt, acidic salt and basis salt. In case of this experiment we will use normal salt(M _{you use by measuring the amount of carbon dioxide you get from carbonate salt after the reaction is over. Carbon dioxide is produced in the same quantity of moles as the number of carbonate salt reacted.Avogadro's law is an experimental gas law relating volume of a gas to the amount of substance of gas present. Avogadro's law states that, "equal volumes of all gases, at the same temperature and pressure, have the same number of molecules" The volume and moles of the gas are directly proportional, if the temperature and pressure are constant. (Molar Volume = 22.4L,0 ^{{} ^{0}}C, 1atm)The definition of mole is the unit of measurement for amount of substance. ()The definition of Molar concentration is a measure of a solute in a solution. (mol/L)Ideal gas law also called general gas equation, is the equation of state of a hypothetical ideal gas (PV=nRT)n(number of mole) ={PV} over {RT} ={1atm TIMES V/L} over {0.082atm TIMES T} P : Pressure (atm)V : The volume of the carbon dioxide (L)n : Tb Stand, Support stand and Burette clamp, filler, 25ml burette, bunner, Boiling test tube,Reagent ? 6M HCl solution, Alkali metal Carbonate4. Experiment Procedure1) Connect the burette, rubber stopper and silicon tubes to the bottom of the Leveling bulb2) Water is added in leveling bulb. And adjust the water height to the 2/3 point of the Leveling bulb.3) Add 200ml distilled water to a 250ml erlenmeyer flask with 0.3g of the unknown carbonate sample(M2CO3) and 1ml of 6M HCl into the erlenmeyer flask. Instantly connect the erlenmeyer flask to the rubber stopper. And shake the erlenmyer flask gently that to saturation with CO2.4) Read the measurement on the scale (height of water) in the burette.5) 20ml of 6M HCl is added to new Erlenmeyer flask and add 0.1g of M2CO3 to a erlenmeyer flask. And then quickly reconnect to the stopper.6) Shake the flask until no more carbon dioxide gas is generated. (Until the solution becomes transparent.)7) After moving the bulb so the level of water is atpressure of water : 17.54mmHg1atm = 760mmHgP = 760mmHg?17.54mmHg=742.46mmHg= 0.977atm3) Measured volume : ___ LMixture volume : 200ml water + 0.3gM _{2}CO _{ 3} + 1ml 6M HCl = 201ml4)Amount of CO2 saturated in the 20ml 6M HCl solution : 0.0006 mol5) Total amount of CO2 : _____ molM _{2} CO _{3} +HCl`` -> ``2M ^{+} `+`2Cl ^{-} +`H _{2} O+`CO _{2}uparrowBy adding 0.1g of M2CO3 to a erlenmeyer flask, the volume of gas was changed 6ml to 10.9ml.(Molar Volume = 22.4L, 0{} ^{{} ^{0}}C, 1atm)22.4LTIMES (273 +20)/273 = 24.04LRARROW (Molar Volume = 24.04L, 20{} ^{{} ^{0}}C)(PV=nRT) P:0.977atm V:24.04L T:293.15KR = PV/nT = (0.977atm×24.04L)/(1×293.15K) = 0.0801atm?L/mol?Kn ={PV} over {RT} ={0.977atm TIMES 4.9ml} over {0.0801atm TIMES 293.15K} = 0.000203molThe number of gas mole = 0.000203mol6) Room temperature : 20℃ = 293.15K ( [K] = [{} ^{{} ^{0}}C] + 273.15 )7) Then you can calculate the molar mass(M) of M2CO3.M _{2} CO _{3} +HCl`` -> ``2M ^{+} `+`2Cl ^{-} +`H _{2} O+`CO _{2}uparrow Carbon dioateby measuring the amount of carbon dioxide produced when thesample reacts with HCl.There was a great deal of uncertainty and error in this experiment.There are some kinds of factor that influences the result of experi-ment. Such as changes in the vapor pressure of water depending on temperature, the solubility of CO2 in water, error in measuring the amount of reagent or measuring the volume of the gas, CO2 gas may escape during opening of the flask, and I didn’t maintain the level of water is at the same height as in the burette.I think that the last two factors may have a big effect on the volume of gas. A lot of CO2 gas can escape during the process.Because of leaking some CO2 gas and not maintaining the height of water, the difference between height of water is increased as it react. So, the change of the gas volume may measured smaller than it really was.The CO2 is produced in the same quantity of moles as the number of M2CO3 reacted. The small-measured volume of CO2 makes me thiedia

자연과학| 2020.01.08| 7페이지| 1,000원| 조회(737)

분석, 일반화학실험, 일반화학, 화학실험, 탄산염, Analysis of Carb..

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