Questions Why does the pink color‚ which forms at the point where the NaOH comes into contact with the solution in the flask‚ disappear more slowly near the endpoint? The reason is that the Phenolphthalein indicator slightly dissolve in HCl solution‚ the OH-ions reacted with Phenolphthalein indicator first then titrates with H+ ions. As the NaOH solution dripped into the flask‚ the OH-ions react with H+ions and the pink color disappear. However the H+ is limited‚ as adding more OH-‚ all H+ ions will
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Determining the Unknown Concentration of NaHCO3 (aq) Through Titration Introduction Titration is the accurate addition of a titrant- solution in a burette- into a measured volume of a sample (Kessel‚ 2003). There are many different types of titration‚ such as acid-base reaction‚ redox reactions‚ precipitation reaction and more (Dohrman). In this lab an acid base titration will be explored. In an acid-base titration‚ the concentration of an acid or base is unknown and is determined by the adding
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affect the volume of NaOH used to titrate the solutions by approximately 0.01ml. Moreover‚ it is not certain that the right amount of indicator was used for the titration of the unknown acid in trial 2. It is stated that 2 drops of indicator should be used. It was uncertain whether 1 drop or 2 drops were used. Another drop was added. Using the wrong amount of indicator‚ such as too much can shift the end point which tampers the results dramatically. Conclusion The objective of this lab
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Experiment 1: Observations of Chemical Changes Abstract: In the lab 1 experiment‚ the objective was to observed properties of various chemical reactions between twelve different basic compounds. Each reaction revealed chemical properties consisting of color change‚ CO2 gas formation‚ and/or precipitate formation. Certain reactions made it possible to distinguish between an acid and a base. Through the results of this experiment‚ chemical properties observed in the reactions could be used to associate
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range for the scale is 0-14. If something has a pH value of 0‚ it is extremely acidic‚ while the opposite is if something is a 14 it is extremely basic. Pure water has a pH of 7 and is very neutral. Either extreme can be harmful to humans. The indicator is typically a chemical that changes color if it comes in contact with an acid or a base (How Can You Tell If Something Is An Acid Or A Base‚ 2007). One way of making this happen is to add an acid or a base to something like red cabbage
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CLICK TO DOWNLOAD ECO 550 Midterm Quiz This midterm exam consist of 32 multiple choice questions and covers the material in Chapters 1 through 8. There are four questions from each chapter. 1). The flat-screen plasma TVs are selling extremely well. The originators of this technology are earning higher profits. What theory of profit best reflects the performance of the plasma screen makers? 2). To reduce Agency Problems‚ executive compensation should be designed to: 3). Economic profit is defined
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aprons paper for data table graduated cylinder unknown I substance beakers/test tubes stirring rod litmus paper pH indicator paper pH color chart phenolphthalein scoopula eye-dropper digital pH meter magnesium ribbon calculator unknown II substance forceps sodium bicarbonate Procedures: Test the pH of the Unknown substances with litmus paper and pH indicator paper and match to color chart Test the Unknowns with phenolphthalein solution Add magnesium ribbon to Unknowns to see
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H2O(l) + NaCl(aq) Percentage by mass of calcium carbonate in eggshell can then be calculated by the following formula: % by mass of CaCO3 = Requirements eggshell burette‚ 50 cm3‚ and stand pipette‚ 25 cm3 pipette filler methyl orange indicator 1 M NaOH solution‚ standardized 1 M hydrochloric acid‚ standardized ethanol wash-bottle with de-ionized water mortar and pestle forceps safety spectacles 2 beakers‚ 100 cm3 volumetric flask‚ 250 cm3 filter funnel‚ small magnetic stirrer
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tested. Data Table 1: Chemicals Provided in Lab Kit. Well # Chemicals Reaction A-1 NaHCO3 and HCl-C02 Remained clear‚ very bubbly‚ almost as if forming a gas‚ which it was. Carbon Dioxide. B-1 HCl and BTB The results of adding the blue indicator was a color change. It turned orange‚ indicating acidity. C-1 NH3 and BTB It remained blue‚ indicating a base. D-1 HCl and blue dye The mixture turned green. E-1 Blue dye and NaOCl Blue at first‚ then when HCL was added to the mix‚ it turned green
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A Research and Experiment On Permanent Markers F1C-G-036 2013 Science Fair Table Of Contents Research Research on Permanent Markers pg 1 Experiment Statement of purpose pg 2 Hypothesis pg 2 Materials pg 4 Procedure pgs 4-5 Observation and Results pg 6 Conclusion pg 7 Bibliography pg 8 Research We made research of this topic on the World Wide Web‚ we found out more about what a Permanent
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