Determination Of Zinc And Nickel Concentration By (1) Ion Exchange Chromatography Followed By Chelometric Titration, And By (2) Atomic Absorption Spectroscopy Of The Mixture

1331 words - 5 pages

Determination of Zinc and Nickel Concentration by (1) Ion-Exchange Chromatography Followed by Chelometric Titration, and by (2) Atomic Absorption Spectroscopy of the MixtureExperiment 4Dates of Experiment: 10/14/08 through 10/30/08Date of Report: 11/7/08Chem 2262LI. IntroductionIn this experiment, the zinc and nickel contents of unknowns were tested using two methods. In the first method, nickel and zinc were separated through ion-exchange chromatography and analyzed through chelometric titration. In the second method, the unknown was analyzed through the atomic absorption spectroscopy (AAS) of the mixture.In and ion-exchange column, the ions are separated due to their tendencies to interact with the fixed phase of the column. In this case, the anion-exchange resin is that fixed phase. Nickel passed through the column unhindered and therefore first. Zinc formed chlorozincate anions that reacted with the resin. It could not pass through the column until a neutral aqueous solution was run through. The elements were determined quantitatively by titration with ethylenediaminetetraacetic acid (EDTA). This method is valued as a good estimate and is used widely because of its use of common lab equipment. Only a single column was run for each metal in the interest of time. To acquire a meaning for the effect that the method has on the outcome, one should split the sample into replicates before the column. However, this may lower the accuracy, reduce the precision, and increase the time of the analysis.In AAS, ions are distinguished due to the wavelength of light emitted when atomized ions are passed through a flame. Each element has a characteristic wavelength of light emitted. The instrument is calibrated using standard solutions prior to passing samples through. The results are interpreted using a calibration curve. This method is valued due to its efficient speed, ease of use, high selectivity, accuracy, and precision. A disadvantage is that it requires a special piece of machinery to do the experiment.II. ProcedureIn order to prepare the ion-exchange column, glass wool was placed above the stopcock of a buret. Thirty to 40 milliliters (mL) of anion-exchange resin were added to the buret. A wash of 100 mL of two molar HCl was passed through the column. The sample was prepared by adding 16 mL of concentrated HCl to 75 mL of unknown solution and diluting that to 100 mL. The 30 mL sample was transferred to the top of the column. Four hundred mL of two molar HCl were washed through the column after the sample at a rate of 5 mL a minute. All of the wash was collected in a 500 mL beaker. The beaker was replaced with another 500 mL beaker in order to catch the next wash of 450 mL of deionized water.The first beaker contained the nickel sample. It was divided into three aliquots, and the liquid was evaporated. Each residue was dissolved in 100 mL of distilled water and mixed together. Approximately 10 mL of pH 10 buffer were added. The entire solution was...

Find Another Essay On Determination of Zinc and Nickel Concentration by (1) Ion-Exchange Chromatography Followed by Chelometric Titration, and by (2) Atomic Absorption Spectroscopy of the Mixture

Discuss Dramatic Importance of Scenes 1 and 2 in "Macbeth" by Shakespeare

532 words - 2 pages asks which horrible form of weather shall they meet in, because for the witches horrible, is always a good thing. They plan to meet Macbeth, hence, the name of the play, this shows that he is also a very important character. The second witch says "When battles lost and won". This tells us that there is a war, or a battle going on. By now the audience knows that Macbeth will have something to do with the witches, and they are left to wonder what will

Nickel And Dimed: Occupations by Barbara Ehrenreich

2222 words - 9 pages Nickel And Dimed: Occupations Barbara Ehrenreich provides evidence in “Nickel and Dimed” that she’s an outstanding author with this book. Its engaging and compelling, no question about that. But it’s hard to get from side to side at times since of the authors attitudes. Her key summit is to carry concentration to the scrape of the working deprived, but she manages to be both abusive and divisive. Occupation on attacking our industrialist

"Nickel and Dimed" by Barbara Ehrenreich.

828 words - 3 pages Eye Opening (If You've Been Living in a Hole)NICKEL AND DIMED: ON (NOT) GETTING BY IN AMERICABy Barbara EhrenreichHenry Holt And Company, 230 pp., $13 (paperback)The back cover and the last chapter's 25-page evaluation are the most gripping parts of this memoir, which without a doubt originated as an attention-grabbing idea but turned out to be an obvious, repetitive, and unrealistic account of American blue-collar life. Barbara Ehrenreich sets

Nickel and Dimed by Barbra Ehrenreich

1952 words - 8 pages Nickel and Dimed, by Barbra Ehrenreich, depicts the truth about low-income living in the United States. But rather than just writing about it, she actually did it. She chose various places across the country to conduct her observation and participation. She did what very few people would have had the courage to do. Hopefully, her book will change the way people look at low-wage work and possibly even change, for the better, the way low-income

Vietnam: The Mixture of Protests and Politics

1644 words - 7 pages ; Lyndon B. Johnson won the presidential election on November 1, 1964. Despite the tension between the “Doves” and the “Hawks”, president Lyndon B. Johnson stood by his policy of slow escalation. As he began his term in office in 1965, he was confident that his programs to better the nation would be established despite that “nagging little war in Vietnam”# as News Week reported it.      Protests have long been a way

To determine the % by mass of manganese (IV) oxide in a solid sample. ( By Titration )

514 words - 2 pages Procedure:1. All instruments were washed by using deionised water.2. 25cm3 of sodium thiosulphate solution was pipetted out and pour into a volumetric flask.3. Deionised water was added to the graduation mark.Part A1. Diluted sodium thiosulphate solution with unknown concentration was poured into the burette.2. 25cm3 of standard 0.027M iodine solution was pipetted out and pour into a conical flask.3. The iodine solution was titrated with sodium

The Picture of Dorian Gray: Short synopsis and author biography followed by an analysis on the use of aestheticism in the novel.

1639 words - 7 pages accidentally shot while some of the guests are hunting in the woods. The situation strikes a chord with Dorian, and he swears he'll change, but finds he cannot. "He has no moral groundings to support moral choices" (Themes 2). He's gone too far into his immoral lifestyle and spent too much time suppressing his conscience which is beginning to get to him.He tries to silence his conscience by driving his knife into the portrait. The portrait

Titration-finding the concentration of a solution of sulphuric acid

2455 words - 10 pages - 0.15 moldm-3The average concentration of the sulphuric acid is:0.05 + 0.15 = 0.1 moldm-32Concentration (moldm-3) = concentration (g dm-3)Molar mass (g mol-1)Mr of Na2CO3 = (23 x 2) + ( 16 x 3)= 106 g mol-1250cm3 x 0.1moldm-3 x 106 gmol-1 = 2.650g1000cm3I will use 2.650g of Na2CO3 in 250cm3 of distilled water.Apparatus· Weighing bottle· Clamp stand· Glass rod· 250cm3 volumetric flask

Quantitative Determination of Sulphate By Gravimetric Analysis

1614 words - 6 pages analysis is being carried out by the following steps: (1) preparing a solution containing a known weight, (2) isolation of the desired elements, (3) weighing the separated elements and (4) computation of the amount of constituent in the sample from the observed weight of the isolated substance. Precipitation and filtration are the most commonly used methods to isolate the desired substances from a solution. The reagents used in the reactions will form

Quantitative Determination of Sulfate by Gravimetric Analysis

559 words - 2 pages SynopsisThe objective of this experiment is to find out the different mechanical properties of General Purpose Polystyrene (GPPS), High Impact Polystyrene (HIPS), High Density Polyethylene (HDPE) and Polypropylene (PP). We obtained the average tensile strength, tensile modulus and yield strength of each specimens by using LLOYD tensile testing machine. We found out that GPPS specimens having the highest tensile strength and tensile modulus, and

Nurse’s Song 1 and Nurse’s Song 2 by Blake

1194 words - 5 pages Nurse’s Song 1 and Nurse’s Song 2 by Blake In looking at the poems Nurse’s Song 1 and Nurse’s Song 2, one has to look at the titles of the book in which they are in, the words themselves, and the etchings that go along with the poem. In the Nurse’s Song 1, the book that it is in is called Songs of Innocence. The title of the book shows to the reader that the narrator is writing from the point of view that she is watching children play

Similar Essays

Determination Of Cu2+ By Titration Essay

658 words - 3 pages Determination of Cu2+ by Titration Introduction: The purpose of this lab is to determine the concentration of copper ions in an unknown solution. Complexometric titration will be used to determine the concentration. A buret will be used to deliver the complexing agent to the unknown solution. Ethylenediaminetetraacetic acid will be used as the complexing reagent. An indicator, Murexide in our case, will be used to indicate the endpoint of

Part Of The Neuron Affected, Inhibitory Or Excitatory Potential Changes And Ion Channels Affected By Psilocybin

1617 words - 6 pages Part of the Neuron Affected, Inhibitory or Excitatory Potential Changes and Ion Channels Affected by Psilocybin Psilocybin belongs to the classification of drugs called hallucinogens. Hallucinogens typically act by stimulating serotonin receptors at different times or for longer durations than serotonin itself would (Kalat 2004). When psilocybin enters the brain, the enzyme alkaline breaks down one of its phosphate groups

Colorimetric Determination For The Composition And Equilibrium Constant For The Formation Of A Metal Complex Ion

1571 words - 6 pages this, the concentration of Fe3+ was plotted against the absorbance over the concentration of Fe3+. Using Beer’s Law of the absorbance of light through aqueous solutions, the equation of Mo = Lo *ac(Mo/Ac)-(1/k) Was used, with Mo being the initial concentration of Fe3+, Lo being the initial concentration of SCN-, ac as the absorption coefficient of FeSCN+2, Ac being the absorbance of [FeSCN+2] and k being the equilibrium constant. This equation

Book Review Of Nickel And Dimed By Barbara Ehrenreich

1048 words - 4 pages Before making a great success in the restaurant and wholesale beverage businesses, Alice Foote MacDougall and her three children had been thrust into deep poverty by her husband's financial failure. Raised in wealth and high social standing, she had been forced to ask relatives for help and was humiliated by their presumptuous inquiries about her lifestyle and expenditures. In her autobiography, recalling the period of deep poverty that followed