9.5 – 5.0 = 4.5. Therefore 4.5 mL of NaOH was needed to neutralize HCl. Table 3: The amount of NaOH (mL) needed to neutralize HCl in Condition 1‚ 2 ‚ and 3 and their 3 trials. Trial 1 (mL) Trial 2 (mL) Trial 3 (mL) Condition 1 4.5 4.0 4.0 Condition 2 8.0 8.0 9.0 Condition 3 9.5 9.0 9.5 2. Sample Average Calculation of Condition 1: Table 4: The average volume (mL) of HCl & NaOH in each Condition Average Volume of HCl & NaOH Condition 1 9.2 Condition 2 16.5
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November 3‚ 2014 Chemistry 1411- 106 Pre Lab Experiment #8 Objective: This Lab will help us to understand oxidation reduction and double displacement through finding the percent composition of pennies. We will also once again be working with titration in this lab. We will titrate the solution until we are only left with a solid form which will tell us about the composition of pennies. Introduction: The weight of a post 1982 penny is 2.5 grams‚ and the percent of zinc is 97.5% leaving only 2.5% copper
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= 30.02 g Weight II (beaker + 1-bromobutane) = 30.64g Weight of 1-bromobutane = WII - WI = 30.64 - 30.02 = 0.62 g Molar Mass of 1-bromobutane (C4H9Br) = 137.02 g/mol Molar Mass of butyl benzoate (C11H14O2) = 178.23g/mol Mole ratio = 1:1 Limiting agent: 1-bromobutane Density of 1-bromobutane= 1.27g/ml‚ Volume = 2.0ml Mass of 1-bromobutane = 1.27 x 2.0 = 2.54g Theoretical mass of 1-bromobutane = 2.54 /
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Reetika Kashyap September 20th‚ 2012 Enzyme Lab What is an enzyme? Enzymes are specialized protein molecules simplifying most of the body’s metabolic processes such as‚ supplying energy‚ digesting foods‚ purifying your blood‚ executing the body of waste products etc. Enzymes act as catalyst by speeding up the reactions that happen in our bodies and decreasing the amount of activation energy needed to break a complex down. A reactant is any given enzymatic reaction is called a substrate for that
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mass of the amount of unknown acid X measured in grams (±0.001g) Table 2: Table of reading of the burette initially filled with 25mL of 0.201moldm-3 sodium hydroxide (NaOH) to titrate 25mL (±0.03mL) of unknown acid X in mL (±0.05mL) after each titre. Reading on the burette initially filled with 25mL of 0.201moldm-3 NaOH (±0.05mL) First titre 21.3 Second titre 18.2 Third titre 15.2 Fourth titre 12.0 Qualitative data Observations: When dissolving the acid X in the water‚ most of
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Background: Techniques used were in accordance with NMU Professor Dr. D. Becker’s lab manual (ISBN 0-390-53911- 2; McGraw Hill). Changes in protocol or interpretation are noted where they were implemented‚ but strict adherence to the manual prevailed. Materials and Methods: Microscope‚ incubator‚ and deionizer functioned correctly throughout testing period‚ with stains‚ dishes‚ agars‚ and test reagents readily available. Lab procedures are considered orthodox and usage thereof is noted chronologically
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point of this lab is to give the groups an idea how DNA can be transformed by a bacteria to improve the lives of people. Transformation happened when a gene is transferred from one bacterium to another one on a plasmid. E. coli is the organism that genetics prefer to use because it can be easily grown and suspended
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a strong base. The titrant reacts with and consumes the acid via a neutralization reaction. The point at which stoichiometric amounts of the acid and base have combined is the equivalence point. An example of this is shown in the equation: HCl(aq)+NaOH(aq)NaCl(aq)+H2O(l). The number of moles is given by knowing the exact concentration and volume added of the titrant. The latter‚ in turn‚ is related by stoichiometry to the number of moles of acid initially present in the unknown. To detect the equivalence
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copper penny. Variables: There were no variables at this experiment PROCEDURES: Materials: Zinc (SN) filling‚ 3M NaOH solution‚ Copper penny‚ tongs‚ Hot plate‚ 100 ml beaker‚ 250 ml beaker‚ Bunsen burner‚ Water‚ Spoon. Procedure: First‚ we turned on the hot plate. Then‚ we filled 250 ml beaker with 125 ml of water. We put half a spoon of zinc fillings. We add 20 ml of 3M NaOH solutions in it. We placed the beaker on the hot plate‚ which we had turned on before. We put the penny into the
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Abstract For the amount of aspirin in a commercial tablet to be determined‚ different solutions of acetylsalicylic acid mixed with NaOH were created at different concentrations. All the different solutions were then analysed using Novaspec photometer‚ which allowed for a graph to be created and a line of best fit to be made. The amount of aspirin in a commercial tablet was found to be 350mg. Introduction The molecular formula for aspirin‚ also known as acetylsalicylic acid‚ is C9H8O4. It is most
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