Synopsis The objective of this experiment is to determine the percentage by mass of calcium carbonate‚CaCO3 in toothpaste using back titration technique. A known weight portion of toothpaste is obtained to react with known volume and concentration of standard acid solution. After completing the reaction‚ the resulting solution containing excess acid is back titrated with known volume and concentration of standard base solution. Determination of excess acid after reaction allow us to calculate the
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To Hell and Back On the surface‚ Edgar Allen Poe’s “The Pit and the Pendulum” relates the story of a man tortured by the Spanish Inquisition. The man‚ remains nameless throughout the story‚ is condemned to death for an unknown crime and loses consciousness. He awakens in complete darkness and is frightened that he has been locked in a tomb but shortly realizes that he is probably in a dungeon. After exploring the enclosement‚ the prisoner collapses and falls asleep. He wakes up to an offering of
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Back to School: A Comparative Essay Walking back into school for the first time in years sent a rush of memories through my mind‚ from the tree I used to climb after school to the conversation that lead to the premature loss of my virginity and so much more. Surprisingly‚ my emotions lead me to something else altogether…looking at the dull concrete walls‚ iron laced windows and towering fences I realized; public school truly is a prison. Mind you‚ your average middle or high school may not have
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Back to School: Education is very important. It determines what you can do in life. It concludes who you will become. President Barack Obama believes that education is vital and his domestic policy is still focused on education. Why does Barack Obama believe that education is so important to the United States? Why does Obama think education will make the U.S. more competitive? President Barack Obama addresses the target audience directly. The target audience is the students from kindergarten
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Parker’s back Parker’s back In the story parker’s back the author reveals‚ the contradiction of the holy woman and the man that is prevailed to be the sinner. I feel that Parker grew from a boy to a man without realizing the inner changes he made. Parker is characterized as a ladies man that is covered in tattoos and swears a great deal. From a young age he is rebellious and doesn’t commit to anything. I believe that as a boy Parker thought foolish things such as tattoos‚ drinking‚ swearing
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Lee 1 Lee Andrew Pamela Gressier English 105 May 23rd‚ 2014 There And Back Again Growing up‚ one of my most favorite places to go as a child was the jungle gym at Wardlow Park. I was always fascinated with the jungle gyms and park‚ and always made it my daily personal mission to go as much as I could. However‚ the Wardlow Park is vastly different now then it was back when I was a little kid. From the environment to the current inhabitants‚ almost every aspect of the park has changed. When
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the concept of the flux capacitor. Before Doc can make his first trip‚ Libyan terrorists‚ from whom he stole the plutonium‚ arrive and shoot him. Marty attempts to escape using the machine and inadvertently activates the time machine where he travels back to 1955 and finds himself without the plutonium needed for the return trip. While exploring the 1955 Hill Valley‚ Marty meets the teenage George who is being bullied by Biff Tannen. As George is about to be hit by Lorraine’s father’s car‚ Marty pushes
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Porter’s model highly focuses on rivalry and profitability but has some major limitations that have many organizations consistently reevaluating their strategic plans. Porter indirectly rebutted the assertions of other forces‚ by referring to innovation‚ government‚ and complementary products and services as "factors" that affect the five forces (Porter‚ 2008). He assumed that his model will allow markets to stay fairly stable‚ not taking into account brisk technological advances or increasing competition
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What is power? Power is having strength and being forceful‚ physically applying your strength to another individual. In order to become powerful‚ steps are always considered‚ you aren’t powerful with a blink of an eye‚ you have to start from scratch‚ being powerless. One of the fundamental expectations underlying this premise is the capacity or ability to direct or influence behaviour of others or the course of events. Power can be gained or lost. Both central protagonists from Frank Darabonts Shawshank
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BACK TITRATION AIM - To estimate volumetrically the amount of calcium carbonate present in the eggshell and analyzing the sources of errors to evaluate the result. Part A: Standardization of 2M NaOH(aq) Data Collection : Weight of substances Uncertainty Weight of watch glass + salt (potassium hydrogen phthalate) w1= 23.4380g ± 0.001g Weight of watch glass ( after emptying the salt)w2 = 21.5430g ± 0.001g Weight of salt (potassium hydrogen phthalate) w1 –w2= (23.4380± 0.001g) – (21
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