10. The gravimetric determination of nickel in alloys Gravimetric analyses belong to the most precise‚ because contemporary analytical balances make possible determination of the mass of a sample with great accuracy. In these analyses one should obtain high purity compound of the analyzed element or a compound directly obtained from the analyzed substance). This reaction has to be exactly stoichiometric. It is also important that the weighed compound was non-hydroscopic and stable in air‚ it also
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has a specific trait. For i.e. If sugar ferments there will be a color change. III. Reagents: 1.Tryptone 2.Yeast extract 3.NaCl 4.KCl 5.MgCl2 6. MgSO4 7.Glucose/ Dextrose 8.H20 9.Agar( for solid) IV. Methods Grab an Erlenhymer flask for the solid solution and another flask for the liquid solution. Label both flasks. Put 200 ml of distilled water in each flask Then weigh out each of the reagents. Pour the reagents into each flask Swirl/mix the liquid flask. When everything is dissolved cap it off
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correctly. 1. The substrate for amylase is Your answer : b. starch. Correct answer: e. starch and carbohydrate. 2. Which of the following is true of enzymes? You correctly answered: c. Their activity can be affected by temperature and pH. 3. The reagent IKI tests for the presence of You correctly answered: a. starch. 4. Which of the following is not true of controls? You correctly answered: d. A negative result with a positive control is required to validate the test 5. Which of the following is
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Indigo Synthesis Author: Carolina Morales Group #1 Lab Partners: Jennifer Capeloto‚ Samantha Hoffman and Adriana Garibay Instructor: Saehan Park Chem. 152‚ Section 43 Date Work Performed: February 10‚ 2010 Date Work Submitted: February 24‚ 2010 Abstract: The percent yield of the color Indigo that is the color of blue jeans for the three trials was determined to be 13.50%‚ 15.30% and 14.80%. A series of experiments were performed to a cloth dye comparison. The absorbance
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UNKNOW BACTERIA LAB REPORT UNKNOWN 36 Introduction The purpose of this lab was to identify two unknown bacteria from a mixed culture. The reason for identification of unknown bacteria was to help students recognize different bacteria through different biochemical tests and characteristics. This is important in the medical field because identification of unknown bacteria can help treat a patient by knowing the contributing source of a disease. Also knowledge of different bacteria helped others
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the substance that is used up first in a chemical reaction. The amount of product was limited by that reagent. The excess reactants were considered to be the other reagents that were presented in excess of the quantity that was reacted with the limiting reagent. The theoretical yield was determined as the amount of product obtained when the limiting reagent was completely used. The limiting reagent was identified in order to calculate the percent yield of the reaction.
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oil (O) (1 point) butter (B) (1 point) flour (F) (1 point) unknown 1 (1 point) unknown 2 (1 point) unknown 3 (1 point) unknown 4 (1 point) List whether each of the following substances was positive or negative for protein‚ as indicated by the Biuret test. (7 points) chicken soup (1 point) water (1 point) gelatin (1 point) unknown 1 (1 point) unknown 2 (1 point) unknown 3 (1 point) unknown 4 (1 point) Report the results from the catalase test. (3 points) Liver Catalase present? Yes/No
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November 15‚ 2007 Synthesis of 1-Bromobutane Introduction: The purpose of this experiment is to synthesize 1-bromobutane from 1-butanol and sodium bromide. In order for this reaction to reach completion there are four major operations that need to be performed. The four major operations include refluxing‚ simple distillation‚ separation‚ and drying. To begin‚ in order for the compounds to react they will be dissolved in water and sulfuric acid will be added. The addition of sulfuric acid will
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Discussion Exercise 19 “Qualitative Test for some Cations 1”. For this exercise we obtained 3 test tube‚ each test tube was treated with different reagent (6N HCl‚ hot H2O‚ K2CrO4‚ 6N NH4OH‚ 6N HNO3). TT 1‚2 and 3 with reagent treatment 6N form a white precipitate‚ TT 1 with hot H2O was dissolved and color orange while TT 2 and 3 was undissolved. For reagent treatment K2CrO4‚ TT 1 form yellow precipitate‚ TT 2 treated with 6N NH4OH was dissolved while on TT 3 it form black precipitate. Lastly‚ for TT
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that there are no redox reactions occurring. The next test to be conducted will be Feulgen’s/Schiff’s stain for DNA. This test uses Schiff’s reagent to detect aldehyde groups or CHO-. From the results we will be able to determine whether or not DNA is present and how much DNA the organism contains. If the reagent turns pink/red DNA is present. If the reagent does not have a color change DNA is not present. Biuret’s test would then be conducted to test for proteins. A positive test would be represented
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