Flame tests help us produce colors of metallic ions. The secondary purpose of the lab was to identify unknown compounds that we would test and then guess as to what they were. Dec 27, 2017 flame test lab report 27 dec, 2017 free essays, lab report 0 laboratory activity flame test summary the purpose of this lab. For this lab we got a whole bunch of compounds and burned them to observe the flame and frequency based off the color of the flame. When placed in a flame, aluminum does not change the flames color, and so a visual flame test cannot be used to show the presence of al. This page describes how to do a flame test for a range of metal ions, and briefly. The color is a combination of wavelengths of each transition and used to identify the ion. View the color change in the flame and note it in the data table.
Perform a flame test to identify the characteristic color of metal ions. It was then placed in the burner flame for a few moments. Also, different intensities were seen throughout the experiment. The human error that could have occurred is when the metal loop is. Flame tests lab report free essay example studymoose. Record the color of the flame when the wire loop first enters the flame. After several tests for each solution it was determined that the accepted values for each solution, in order, were. The potassium flame can be seen in the presence of sodium by viewing the flame through a dark blue cobaltglass filter, which absorbs the yellow light from na, but allows the light from k to pass. The flame test is an analytical chemistry method used to help identify metal ions. For each metal cation flame test performed, determine the.
Sources of errors in a flame test experiment answers. Immediately extinguish the qtip if it actually begins to burn. For other metals, there are usually other easy methods that are more reliable but the flame test can give a useful hint as to where to look. Oct 06, 2007 the colours if th flames come from the metals. Have students individually answer the following questions, which are provided on the flame test worksheet. Identify unknown metallic ions by means of its flame test. Flame test lab report salt chemistry metals free 30day trial. Homework statement in a flame test lab, where different unknown substances are heated and the identity of the substance is determined by the. The purpose of this lab was to allow us to observe compounds and how they react to an energy in different ways. Precision refers to the reproducibility of a measurement while accuracy is a measure of the closeness to true value. In todays lab, we will observe the visible range of light emission. The flame test is used to visually determine the identity of an unknown metal or metalloid ion based on the characteristic color the salt turns the flame of a bunsen burner. For example, the sodium solution gave off an orange color, and it had a high intensity.
Do not at any time touch the end of the wire loop used in the flame tests. Analytical electron microscopy of lung granulomas associated with exposure to coating materials carried carried glass wool fibers, ehp, vol 118 2, feb 2010 name period date flame test lab. When metal salts ionic compounds are heated in a bunsen burner flame, the metal gives off a characteristic color. Different elements produce different colored flames when placed in the fire of a bunsen burner. The flame emits a color because each element has an exactly defined emission spectrum, which one can use to identify them. The identification of an element by placing atoms of a metal into a flame, electrons absorb energy and jump to an. Procedure as you perform the experiment, record your observations in data table 1. Hypothesis if the element independent variable is placed in the fire controlled variable, then the. Have students write a lab report that includes the five criteria listed on the worksheet, and explained in the assessments section with answers. Flame tests and atomic spectra experiment chemistry. Learn vocabulary, terms, and more with flashcards, games, and other study tools. I believe this to be true because it had the same bright orange flame the first time i tested it earlier. How to do a flame test for qualitative analysis thoughtco.
The position of the wire, too low and you wont get an accurate result. Appendix at the end of this lab manual contains accuracy data for most instruments you will use, but the best way to assess the accuracy of a measurement is to compare with a known standard. Back in the 18th century, chemists began using flame tests to identify and distinguish elements. Discussion of results the results of the flame test were as follows. Conclusions from burning the metals in this flame test i. Langes handbook of chemistry, 8th edition, handbook publishers inc. Flame tests are used to identify the presence of a relatively small number of metal ions in a compound. This page describes how to do a flame test for a range of metal ions, and briefly describes how the flame colour arises.
This wire gets extremely hot and can cause severe burns. Solution element color of flame cacl 2 ca bright orange reddish tint kcl k purple bacl 2 ba yellow srcl 2 sr red cucl 2 cu green nacl na orange yellowish tint the unknown solution g had an orange colored flame with a yellowish tint, the unknown solution d had a green colored flame, and the unknown solution t had a red. Im supposed to write a conclusion for a flame test lab. In this flame test experiment, seven different known solutions and. How long the wire is kept in the fire, how strong the fire is. Every element has a signature emission spectrum that can be used to differentiate between one element and another. Looselyheld electrons are excited quickly in a flame. Be creative when describing the colors, for example use nail polish or crayola crayon names. For this situation, it may be possible to calibrate the balances with a standard mass that is accurate. Traces of impurities from the last substance tested. Experiment 8 investigates the production of biodiesel via base catalyzed. Analysis of this light can be used to identify elements and molecules. In this laboratory activity, the characteristic color of light emitted for calcium, copper, lithium, potassium, sodium, and strontium will be observed.
Metals in column one million and a pair of as nicely as cu will provide colour. How prezi does project status updates with a distributed workplace. For each test, the nichrome wire was clean, so as not to contaminate the solutions. For group 1 compounds, flame tests are usually by far the easiest way of identifying which metal you have got. Do not taste any of the substances or touch them with your hands duh. Analysis of errors revised 29 1 analysis of errors precision and accuracy two terms are commonly associated with any discussion of error.
Abstractin the flame test lab, the flame test was performed to excite the electrons in the samples and observe the color of the flame. The heat of the flame excites the electrons of the metals ions, causing them to emit visible light. One possibility of this error is because the ratio of 1 m hcl to. Flame test colorful elements experiments steve spangler. Heres how to perform a flame test and how to interpret the colors you see. Light the flame and place the boric acidcovered popsicle stick into the flame. Test the remaining samples in the same way, each with its own wire loop. In a flame test lab, where different unknown substances are heated and the identity of the substance is determined by the color emitted, what can be some sources of error. In this lab you will be given six unknown samples of metal.
The purpose of this lab was to see what colors are characteristic of particular metallic ions in a flame test and use their characteristic color to identify other elements. The solutions used in this lab contain harmful materials. Look for an unexpected color in portions of the flame. Dec 27, 2017 laboratory activity flame test summary the purpose of this lab was to see how different compounds can change color while in a flame and with this color, i can identify the compound. If the compound is placed in the flame of a gas burner, there may be a characteristic color given off that is visible to the naked eye. Is it the metal or the nonmetal that produces the flame test color. To test whether a certain quantity, yis proportional to another variable, x, we can plot a graph of yagainst xand see if the points lie on a straight line.
Cations can be identified by the flame test because the excitation of. If you arent familiar with this lab its when you take a metal and place it in the flame and the flame will change colour. It helps to dim the lights in your lab so the colors are easier to see. My teacher gave us some ideas of what we could talk about in the conclusion. The purpose of this experiment is to determine what colors are characteristics of particular metallic. Identification, properties, and synthesis of an unknown. The test involve putting sample element and see what color appears. Conclusion the purpose of this lab was to see what colors are characteristic of particular metallic ions in a flame test and use their characteristic color to identify other elements. Purpose the purpose of this lab was to reinforce the examination of wavelengths in photons discharged from atoms as they move from high energy to low energy, atomic emmision.
Move the flame under the stick to find the best color. The flame test the flame test is a qualitative test used in chemistry to help determine the identity or possible identity of a metal or metalloid ion found in an ionic compound. Homework equations na the attempt at a solution i need three sources of error, and so far i have this one. For example, sodium makes the flame turn bright orange this is the same orange color made by sodium street lamps and many fireworks. Light the bunsen burner, purpose conclusion the purpose of this lab was to develop an activity series of the elements and to view the spectrum.
The flame test lab was an inclass lab where we tested chemicals in the flames to see the wide range of colors in the color spectrum. In this flame test experiment, seven different known solutions and three different unknown solutions were tested in a burner. This experiment will help one understand how a flame test is performed and that every metal has a unique bright line spectra. This taught us how the light is emitted, how each compound reacts differently, and the observations we made. The metal in the compound was identified by the light orange color seen during the flame test. Discussion of results the results of the flame test were as. Solution observed flame color estimated wavelength nm strontium chloride copper ii chloride potassium chloride unknown experiment conclusions write a lab report with the following information included. The wire was cleaned by rinsing it with distilled water, using a wash bottle. Homework equations na the attempt at a solution i need three sources of error, and so far i have. Also, some metal ions display colors that are similar to each other making it hard to tell them apart.
You can use a flame test to identify a metal or ionic salt. From burning the metals in this flame test, i concluded what the two unknown elements were. Another purpose is to understand how fireworks work. Dec 03, 2015 homework statement in a flame test lab, where different unknown substances are heated and the identity of the substance is determined by the color emitted, what can be some sources of error. In this lab you will be given six unknown samples of metal salt, and you must determine which salt is which.
While its a useful qualitative analysis testand a lot of fun to performit cant be used to identify all metals because not all metal ions yield flame colors. Flame test kit student laboratory kit introduction just as a fingerprint is unique to each person, the color of light emitted by metals heated in a flame is unique to each metal. Place a small scoopful of each metallic solid in corresponding weighing dish. The purpose of the flame test lab is to observe the characteristics colors produced by certain metallic ions when vaporized in a flame. As different elements were tested, various colors were displayed through the flame. Oct 09, 2012 hi, im usually really bad at writing conclusions for labs, but i really need help with this one. The flame test lab showed us how different compounds react to heat and energy and what lights they emit.
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