Loading...

Messages

Proposals

Stuck in your homework and missing deadline? Get urgent help in $10/Page with 24 hours deadline

Get Urgent Writing Help In Your Essays, Assignments, Homeworks, Dissertation, Thesis Or Coursework & Achieve A+ Grades.

Privacy Guaranteed - 100% Plagiarism Free Writing - Free Turnitin Report - Professional And Experienced Writers - 24/7 Online Support

Recrystallization of naphthalene from a mixed solvent lab report

17/04/2021 Client: muhammad11 Deadline: 2 Day

EXP 3-1 RECRYSTALLIZATION (MICROSCALE) UNLV CHEM 241L SUMMER 2020 RECRYSTALLIZATION: Introduction • Read INTRODUCTION and THEORY OF CRYSTALLIZATION sections in the provided lab manual. • Understand the basic concept of recrystallization • Review the polarity concept from the previous lab (solubility and solution) if necessary RECRYSTALLIZATION : Introduction • Recrystallization → a purification technique for solid compounds → the solubility of a compound in a specific solvent is the most important property • Good recrystallization solvent? → sparingly soluble at room temperature → highly soluble at elevated temperature (boiling temperature) RECRYSTALLIZATION : Experimental • Purification of impure naphthalene by two recrystallization solvents → ethanol → hexane • Determine which solvent is a good recrystallization solvent for naphthalene → based on experimental melting point provided in the video → based on the % recovery of naphthalene from each recrystallization Experiment # 3-1: Recrystallization (Micro-scale) INTRODUCTION In most organic chemistry experiments, the desired product is first isolated in an impure form. If this product is a solid, the most common method of purification is crystallization. The general technique involves dissolving the material to be crystallized in a hot solvent (or solvent mixture) and cooling the solution slowly. The dissolved material has a decreased solubility at lower temperatures and will separate from the solution as it is cooled. This phenomenon is called crystallization, if the crystal growth is relatively slow and selective, or precipitation, if the process is rapid and nonselective. Crystallization is an equilibrium process and produces very pure material. A small seed crystal is formed initially, and it then grows layer by layer in a reversible manner. In a sense, the crystal “selects” the correct molecules from the solution. In precipitation, the crystal lattice is formed so rapidly that impurities are trapped within the lattice. Therefore, any attempt at purification with too rapid a process should be avoided. Because the impurities are usually present in much smaller amounts than the compound being crystallized, most of the impurities will remain in the solvent even when it is cooled. The purified substance can then be separated from the solvent and from the impurities by filtration. THOERY OF CRYSTALLIZATION The first problem in performing a crystallization is selecting a solvent in which the material to be crystallized shows the desired solubility behavior. In an ideal case, the material should be sparingly soluble at room temperature and yet quite soluble at the boiling point of the solvent selected. The solubility curve should be steep, as can be seen in line A of Figure 1. A Figure 1. Graph of solubility vs. temperature. 1 curve with a low slope (line B) would not cause significant crystallization when the temperature of the solution was lowered. A solvent in which the material is very soluble at all temperatures (line C) also not be suitable crystallization solvent. The basic problem in performing a crystallization is to select a solvent (or mixed solvent) that provides a steep solubility-vs.-temperature curve for the material to be crystallized. A solvent that allows the behavior shown in line A is an ideal crystallization solvent. A successful crystallization depends on a large difference between the solubility of a material in a hot solvent and its solubility in the same solvent when it is cold. When the impurities in a substance are equally soluble in both the hot and the cold solvent, en effective purification is not easily achieved through crystallization. A material can be purified by crystallization when both the desired substance and the impurity have similar solubilities, but only when the impurity represents a small fraction of the total solid. The desired substance will crystallize on cooling, but the impurities will not. In this experiment, you will perform a micro-scale crystallization. Impure naphthalene will be recrystallized from hexane and ethanol separately, and you will determine a good recrystallization solvent for naphthalene based on melting point measurement and % recovery. PROCEDURE (experiment video, https://youtu.be/cilrcJrcTXM) 1. Prepare a hot water bath using 50 or 100 mL beaker with half-full of water at the beginning of the class. 2. Transfer 0.1 g of impure naphthalene to a Craig tube.

Homework is Completed By:

Writer Writer Name Amount Client Comments & Rating
Instant Homework Helper

ONLINE

Instant Homework Helper

$36

She helped me in last minute in a very reasonable price. She is a lifesaver, I got A+ grade in my homework, I will surely hire her again for my next assignments, Thumbs Up!

Order & Get This Solution Within 3 Hours in $25/Page

Custom Original Solution And Get A+ Grades

  • 100% Plagiarism Free
  • Proper APA/MLA/Harvard Referencing
  • Delivery in 3 Hours After Placing Order
  • Free Turnitin Report
  • Unlimited Revisions
  • Privacy Guaranteed

Order & Get This Solution Within 6 Hours in $20/Page

Custom Original Solution And Get A+ Grades

  • 100% Plagiarism Free
  • Proper APA/MLA/Harvard Referencing
  • Delivery in 6 Hours After Placing Order
  • Free Turnitin Report
  • Unlimited Revisions
  • Privacy Guaranteed

Order & Get This Solution Within 12 Hours in $15/Page

Custom Original Solution And Get A+ Grades

  • 100% Plagiarism Free
  • Proper APA/MLA/Harvard Referencing
  • Delivery in 12 Hours After Placing Order
  • Free Turnitin Report
  • Unlimited Revisions
  • Privacy Guaranteed

6 writers have sent their proposals to do this homework:

Accounting & Finance Mentor
Online Assignment Help
Top Academic Tutor
Assignment Hut
Finance Professor
High Quality Assignments
Writer Writer Name Offer Chat
Accounting & Finance Mentor

ONLINE

Accounting & Finance Mentor

I am known as Unrivaled Quality, Written to Standard, providing Plagiarism-free woork, and Always on Time

$24 Chat With Writer
Online Assignment Help

ONLINE

Online Assignment Help

I am known as Unrivaled Quality, Written to Standard, providing Plagiarism-free woork, and Always on Time

$40 Chat With Writer
Top Academic Tutor

ONLINE

Top Academic Tutor

Hello, I an ranked top 10 freelancers in academic and contents writing. I can write and updated your personal statement with great quality and free of plagiarism

$36 Chat With Writer
Assignment Hut

ONLINE

Assignment Hut

I will cover all the points which you have mentioned in your project details.

$32 Chat With Writer
Finance Professor

ONLINE

Finance Professor

I have read and understood all your initial requirements, and I am very professional in this task.

$48 Chat With Writer
High Quality Assignments

ONLINE

High Quality Assignments

I have read your project details. I can do this within your deadline.

$40 Chat With Writer

Let our expert academic writers to help you in achieving a+ grades in your homework, assignment, quiz or exam.

Similar Homework Questions

Rectangular tray using sheet metal - Https www choosemyplate gov myplateplan - Models of the hydrogen atom lab answers - How does music create suspense in movies - Afi strategy framework - Vocabulario mas usado en ingles - Example of biotic community - Acrostic poem for forgiveness - Middle east geography activities - 17a hylton crescent rosanna - Marketing - Need the following 1. Reflection & Discussion post 2. Short essays - 53 madsen street keperra - Issa specialist in fitness nutrition final exam answers - Buck struck card reader instructions - Us foreign policy regarding the spread of disease in nigeria - Cms intact medical terminology - Energy stored in magnetic field - Qcaa unit plan template - The 4p's of marketing mix - Consumer behavior a strategic approach - Give me liberty eric foner pdf - Part B - Essay about designing rational Agents for (Artificial intelligence) course - 12 week deadlift program pdf - Metropolitan zoo excel - One paragraph essay - +91-8890675453 love marriage problem solution IN Ozhukarai - Mathsmadeeasy a level biology - Potatoes cost janice $1 per pound - Cartoons about sexuality and aging - Answer discussion question in 175 words or less - A liquid's resistance to flowing - Whole foods market 2015 annual report - Discussion Reply- Meghan - Annotate the Bully free classroom - Blood spatter analysis lab - Principles of Macroeconomics Pearson online lab - What is a computer based information system cbis - Mos def rhyme scheme - Equinox products inc income statement - Human body research project - Shipley glen pleasure grounds - Jeffrey smith gmo foods - Australian unity mortgage fund - What is specific rotation of sugar solution - Business growth overview dataset - Grammarly ashford university - HEALTH BEHAVIOR CHANGE PROJECT/ APA PAPER - What money market instrument is used to finance international trade - Registry analysis in digital forensics - Leadership traits of mother teresa - Analysis of home burial - Pros and cons of a socialist economy - Workplace Violence - How to remove contoso from powerpoint - How to calculate buy sell capacity capsim - Percentage of acetic acid in vinegar lab answers - 49 aries way elermore vale - 2 briefly summarize the problem of evil and suffering - Human resources management / organizational behaviour - Abbey dog training swindon - Use case diagram for student admission system - Epidemiology Case # 3 - Quantitative methods exam questions and answers pdf - Cat sat on mat - Levine company uses the perpetual inventory system - Zat you santa claus - Hsc all my own work module 4 answers - Which of the following statements about biodegradable polymers is true - Annabel lee literary devices - Gopro competitive advantage - Woolworths annual report 2017 pdf - The boston photographs thesis - Definition essay - Week 4assignment 1 - Supply and demand test questions - Colorism essay examples - Q &Q A5 - Stepwise management of asthma - Friction, Drag force, Elasticity - Secured transactions questions and answers - Social Work - Ethical issues with milgram's experiment - Liu zhang operates lawson consulting - Need presentation based on uploaded document - Con ecmu sms 1 - On a classified balance sheet a company should report separately - 4.75 pounds to kg - Marketing management orientation concept - Fauji fertilizer share price - What is the meaning of concerto - Pa to n mm2 - Apn advocacy articles - Block and tackle frame - Proof of lodgement when reconciling transactions - Mountbatten institute new york - Apple capital structure analysis - Fire safety survey report - Experiment 1 heart valves and pumps