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

Arcnet 200mbps plc passthrough - Central virginia community college course catalog - Galapagos islands that changed the world movie questions answers - Learning disability assessment tool - SOCIOLOGY - Http grammar ccc commnet edu grammar composition composition htm - Simpson's diversity index formula - When did gerber start making baby food - What is wovi inspection - Paper and discussion - Rapid response ulster hospital - What are pe eyes - Brenda patton was admitted to labor and delivery - Paper due today - Forms queries and reports - Copper cycle lab report answers - Intrinsic carrier concentration of silicon - Gold coast school florida - Acs code of professional conduct assignment - I desire to predict the future witchery - English - Analysis of Existing System (Microsoft Company) - Partial key dependencies - IPM plan - Shauna howe crime scene - Recitatif citation - Car wash marketing plan pdf - April fools day poem by kenn nesbitt - Professional presentation - The pardoner had hair as yellow as wax - The wife of his youth analysis essay - An uncomfortable bed by guy de maupassant - 2 c4h10 13 o2 8 co2 10 h2o - Versailles wedding hall disaster - Billy elliot the musical age suitability - Ethics criminal justice wk2 db - Water by the spoonful by quiara alegría hudes pdf - Recommendation Letter for PMNHN - Data communications and computer networks curt white pdf - Synthesis of nylon 6 - Walmart ethics department - Nursing care - Mzx fire panel manual - Mgt 3810 - Multicultural education in a pluralistic society 10th edition pdf free - Equivalent circuit of 3 winding transformer theory - Is china a ldc or mdc - As11 - Information technology questions and answers pdf - 16 hamilton terrace lamlash - Ideal citizen in a totalitarian government - How to calculate product margin using traditional costing system - Theoretical orientation definition - How much would a person weigh on jupiter - What are the objectives of inventory management - John the savage sparknotes - Https www youtube com watch v ymyofrec5jk - Standardization of naoh with khp lab calculations - What motivates you? Do you have multiple motivators? - Interlink express tracking number - Advertising Assignment II (Two-Part Assignment) PLEASE READ!!! - Infrastructure master fsmo role - Electronic components that store instructions waiting to be executed - CIF7-1 - Paraphrase king's comments on the urgency of now - Boral heathstone price list - Australian solicitors conduct rules nsw - Grant macewan residence hotel - Denver airport case study project management - Capsim book value - Talent recruitment at frog design shanghai case analysis - Music appreciation concert report - On tv tonight gold coast - Marina medical instruments catalog - Round off 1563385 to the nearest million - SBAR - Mythbusters coke and mentos - Skewness of a histogram - Cultural diverdity - Chihuahuan desert animals adaptations - Identify the element in qa3 physical environment - How are instrument systematic errors eliminated when using a theodolite: - Endothermic and exothermic reactions worksheet with answers pdf - Professional growth plan university of phoenix - Advanced combat direction system - Post - 5 5 with dimples potential wife credentials lyrics - Disney wacc - Uq bookshop st lucia - Compute stefani's total standard cost per unit - Contra actions in makeup - Tri component model of attitudes - Broward college career fair - 49 amherst street cammeray - Umuc libs 150 final exam answers - Thornton industries began construction of a warehouse - Sports inventory sheet - How do i find out my tasc results - Assignment 3: America as Superpower-Confrontation in a Nuclear Age (1947-Present) - Aloe barberae root system