Irresistible? By Mikayla Messing 8/3/12 Section 623 Abstract To examine the effectiveness of buffers by titrating two sets of five different solutions using HCl and NaOH and monitoring the pH change of the various solutions. The data collected shows that the buffer systems made with sodium acetate and acetic acid were effect when titrated with the strong acid and the strong base. Comparison of all the solutions shows that the concepts of buffers holds true for the results from the experimentation
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very different further supporting an error in measurement of data. In addition‚ the temperature of the room‚ and of the solution‚ were not measured. These temperatures may have been above 25℃. Data - Part B (80℃): Volume of HCl (mL) pH Volume of HCl (mL) pH Volume of HCl (mL) pH 0 11.22 4.5 9.16 6.6 2.85 2.5 11.06 4.7 8.35 7.1 2.77 3 10.94 4.8 6.64 7.6 2.72 3.5 10.72 5.6 3.37 4 10.35 6.1
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sample | Metal fizzed when dissolved in HCl | Volume of HCl | 100 mL | Initial Temperature | 220 C | Mass of Mg | 0.1485 g | Part B Calculations Tf from graph | 50 C | Mass of HCl | 100 g | ∆TCW for HCl | -2092 J | qHCl for solution | -204.4 J | qCal for cup | -2296.4 J | qRXN | -47594 J | ∆HRXN for Mg | | NET REACTION: 2HCl(aq) + Mg(s)→MgCl2(aq) + H2(g) Part C Description of sample | | Volume of HCl | 100 mL | Temperature of HCl | 220 C | Mass of MgO | 0.5052 g |
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into contact with the solution containing phenolphthalein and base in the receiving flask‚ disappear more slowly near the endpoint? (2I) At the start of the titration‚ the NaOH solution in the flask will be pinkish and the pH is quite high. As HCl drops are added‚ the indicator colour will change momentarily to colourless as the pH is lower in the area around the drop(s). As the endpoint nears‚ the clear colour disappears more slowly as the solution has a lower pH than when the titration started
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Student Number Mark / 100 2011 TRIAL HSC EXAMINATION Chemistry General Instructions • • • • • • • Reading time – 5 minutes Working time – 3 hours Write using black or blue pen Draw diagrams using pencil Board-approved calculators may be used A data sheet and a Periodic Table are provided. Write your Student Number at the top of this page and those of pages 10 and 11. Total Marks – 100 Section I Pages 2 – 24 Confidential Keep Secure 75 marks This section has two parts‚ Part
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complete the assignment in the given interval of time‚ can work for longer hours without any break. My lifestyle is very simple. 4) The main turning point of my life is when I was blessed to join HCL Info Systems Pvt Ltd. 5)I have work experience more than 1 year. right now i am working in HCL Info Systems Pvt Ltd and my designation is Hardware and Network support services since March 27th 2010. As a Technical Service for Customer Support where resolve the issues of the customer on the call
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molar NaOH solution. 2. Record volume. 3. Measure out between 20 milliliters and 40 milliliters of the unknown HCl solution. 4. Record volume. 5. The amount of unknown HCl is then added to the 100-milliliter Erlenmeyer flask. 6. Add two drops of the indicator‚ phenolphthalein‚ to the acid in the flask. 7. Using the slider on the right hand side‚ add NaOH to the HCl in the Erlenmeyer flask (This action is known astitrate). Add the indicator until the color of the indicator turns
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Calorimetry: Enthalpy of Neutralization Introduction: The purpose of this lab experiment was to determine the molar concentration of the unknown HCl by using a coffee cup calorimeter. A coffee cup calorimeter is made of Styrofoam cups with a thermometer that is placed from the top and into the calorimeter to measure the temperature as the reaction happens. The Styrofoam cup used for the calorimeter creates an isolated system as it acts as a heat insulator between the cup and the surrounding
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0.25 molar NaOH solution. 2. Record volume. 3. Measure out between 20 milliliters and 40 milliliters of the unknown HCl solution. 4. Record volume. 5. The amount of unknown HCl is then added to the 100-milliliter Erlenmeyer flask. 6. Add two drops of the indicator‚ phenolphthalein‚ to the acid in the flask. 7. Using the slider on the right hand side‚ add NaOH to the HCl in the Erlenmeyer flask (This action is known as titrate). Add the indicator until the color of the indicator turns a
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A SUMMER TRAINING PROJECT REPORT ON SOURCES & PROCESS OF RECRUITMENT & SELECTION AT HCL SUBMITTED IN THE PARTIAL FULFILLMENT FOR THE AWARD OF DEGREE OF MASTERS IN BUSINESS ADMINISTRATION EXECUTIVE SUMMARY Today‚ in every organisation personnel planning as an activity is necessary. It is an important part of an organisation. Human Resource Planning is a vital ingredient for the success of the organisation in the long run. The objectives of Human Resource Department are Human Resource Planning
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