Experiment 8: Separation of a Mixture of Solids Purpose: The purpose of this lab is to separate the solids mixture containing the iron, sand, benzoic acid and salt. These solids were separated based on the unique properties of different solids such as variation in the magnetic properties and variation is solubility such as ranging from completely insoluble to completely soluble. Procedure: The necessary materials required for this lab procedures was obtained from the labpaq: solids mixture, weighing dish, and digital weighing scale. Each and every solid separated in this lab experiment was weighed using the weighing dish and digital weighing scale. From the solids mixture, the iron filling were separated by using the property of iron fillings that they were attracted towards the magnet.
Possible experimental errors include not properly removing all the iron/salt/benzoic acid from sand. Residue in beaker and cups not completely removed for accurate mass weight. Another error could have been not properly drying the benzoic acid filter paper or sand mixture before weighing. Questions: A. How did your proposed procedures or flow charts at the beginning of this experiment compare to the actual procedures of this lab exercise?
Another error that we made was due to lack of equipment once again. We had to share the Bunsen burner with another group since theirs broke. As a result of this we only held the spatula in the flames for a short while. The colors of flames that are emitted varies or changes as you hold the sample in the flames for a longer period of time therefore, since we held the sample in the flames for only a short while, it might not be enough time for the electrons to absorb enough energy to jump
(0.050) (0.1) = 0.0083 moles b. Pour 8.3 mL of the stock solution to get the amount needed. c. Measure out 8.3 mL in a graduated cylinder 8. Exercise 8: a. 41.8 mL are used b. 0.00079 moles EDTA4- c. 0.00079 moles ZnI2 d. 0.0517 grams of ZnI2 are in the sample e. 0.0517/0.237= 21.8% f. Error Is 6.34% Lab Report: Part 1: In this lab we used the following supplies: * Zinc Iodide * Na2H2EDTA(s) * Calmagite indicator solution * pH 10 buffer solution * 6M Acetic Acid * Unknown Zinc Compound The main purpose for this part of the lab was to determine the amount of zinc ion in a sample of ZnI2 by titration.
Experiment#2 “Separating the Components of a Ternary Mixture” By Mohammad Bazargan Lab partners: Aaron Radtke, Kevin Campbell, Austin Gilchrist Instructor: Professor Mundell Section #: 12 Sep/14/2011 Abstract In this laboratory, we used physical and chemical properties to separate the components of a ternary (three substances) mixture. We also determine the percentage of each substance in the mixture. The percentages are the following,38.2% NaCl, 40.45% SiO2, and 72.84% CaCO3.The mentioned substances were all separated using methods such as filtration, evaporation and reaction with other chemicals which will be explained throughout this report. Intro Mixtures are \ physical combinations of two or more substances where each substance keeps its own chemical identity. Mixtures can be classified as either homogeneous or heterogeneous.
pyridinium hydrobromide perbromide type of stationary phase column length column temperature rate flow of the carrier gas List the 4 general factors that affect the separation obtained on a gas chromatograph What specific technique is used to collect/isolate your purified unknown compound at the end of the recrystallization experiment? suction filtration 14 of 22 4/16/12 9:15 PM StudyBlue Flashcard Printing of Lab Final 2211L UGA
We thought that a pH level of 3 would be the optimal pH level for the enzyme catecholase and its substrate catechol to react in. There was no prior knowledge on the effect of pH levels on catecholase and catechol. The results of the experiment did not confirm this hypothesis; instead the hypothesis was rejected by the results of the experiment. The results showed that tube 1 had the slowest rate of reaction, and actually did not react at all. The results showed that tube 2 had the fastest rate of reaction; this tube was exposed to the neutral pH of 7.
In this lab, two different titrations were performed with three different antacids to determine which brand is the most effective at the cheapest price. The antacids were ground up separately and approximately 0.2 grams of it was placed in a flask. Methyl Orange, an indicator, and a stir bar were added into the flask. The flask was then put on a stir plate which was under a buret with 0.1M hydrochloric acid. The acid was poured into the flask until there was a permanent pink colour.
CHROMATOGRAPHIC METHODS: After successful extraction of phospholipids from their source analysis can be performed for the detection of specific phospholipids. This section will discuss chromatographic methods used for the analysis of phospholipids. All systems of chromatography consist of a stationary and mobile phase. A monster placed on a stationary phase, i.e., a solid or a liquid, and the mobile phase, a gas or a liquid, is allowed by modifying the system. The components of the sample will be separated on the basis of their ranging physical and chemical properties, imparting different affinities for the two phases.
4. Why are boiling chips useful when boiling liquid? Discussion: In this experiment my partner and I misunderstood how far to carry the significant figures. We took them over two decimals places when it really only should have been one decimal place over. Because we didn’t count the proper number of significant figures in the volume we had too many when we went to calculate the density.